Salzstoß und Heißschnitt-Salzstoß

A technical guide to connective tissue processing and fat emulsion systems for sausage production

Eben van Tonder | EarthwormExpress | March 2026

1. Introduction: Naming, Logic, and Architecture

1.1 The Austrian Term and Its English Name

The Austrian term Salzstoß is a defined legal category in the Osterreichisches Lebensmittelbuch (Austrian Food Codex), IV. Auflage, Codexkapitel B 14, Abschnitt B.2.3.3. It refers to the low-fat connective tissue fraction arising from the deseaming of skeletal muscle, specifically tendons (Sehnen) and muscle sheaths (Muskelhäute), held under salted conditions [1]. The Codex defines it in one operative sentence: it is the material, not a process step.

The English trade equivalent chosen here is Salt Batch. The logic of the name follows directly from the German compound. Salz means salt. Stoss in the German butchery trade refers to a prepared batch or charged mass: over a working shift, deseaming operations accumulate tendon, epimysium, and fascial trimmings continuously. These are gathered, salted as one unit, and held for later use. That unit is the Stoss. The English term Salt Batch carries the same meaning: a single consignment of salted connective tissue trim, prepared as a batch and held for use in sausage production.

Salzstoß (German/Austrian) = Salt Batch (English)

1.2 The West African Adaptation and Its Name

The nomadic cattle of West Africa, specifically the Bokolo (White Fulani, Bunaji) and Sokoto Gudali (short-horn Zebu) that dominate the supply at Agege Abattoir in Lagos, present a connective tissue challenge that is fundamentally different from the Austrian raw material situation. The reason is biochemical and is documented in detail in Section 2. The short version: the connective tissue of these animals is so heavily crosslinked that it cannot be prepared by the Austrian method. It requires heat treatment before any functional conditioning can occur.

The method developed for the Lagos operation therefore adapts the Salt Batch concept in two essential ways: the connective tissue fraction is heated before conditioning, and it is bowl cut to a paste rather than paddle mixed to a fibrous matrix. These two adaptations are captured in the name:

Heißschnitt-Salzstoß (German/Austrian) = HeatCut Salt Batch (English)

Heiß is hot. Schnitt is cut. Salzstoß is the parent term. The compound places the West African product in direct relationship to the Austrian original while marking it clearly as a distinct product prepared by heat and cutting rather than by cold conditioning and paddle mixing alone. A German or Austrian meat technologist reading the term immediately understands both its lineage and its departure from the classical method.

1.3 Historical Position of the Salzstoß in Austria

The Salzstoß is codified specifically in the Austrian Food Codex and not in the German Leitsatze fur Fleisch und Fleischerzeugnisse, which gives it a strongly Austrian identity. Its primary technical application is in Bruhwurst production, where it appears in the Codex formulations for Burenwurst (Sorte 3b, 20 parts per 100), Dürre im Kranz and Braunschweiger (Sorte 3b, 20 parts per 100), Jausenwurst and related products (Sorte 3b, 15 parts per 100), and Waldviertler (Sorte 3a, 10 parts per 100) [1][2].

The working method documented by Austrian master butcher Willi Wurm represents craft practice passed down through apprenticeship: connective tissue minced to 5 to 20 mm, salted at 2.0 to 2.5 percent on raw Salzstoß mass, combined with 20 to 40 percent water, paddle mixed until uniformly hydrated, and rested 6 to 24 hours at 0 to 4 degrees Celsius. No bowl cutter is used at any stage. The bowl cutter would reduce the material to paste, destroying the fibrous structure that gives Salt Batch its defining textural contribution to the finished sausage [25].

In modern large-scale industrial production, classical Salzstoß has been substantially replaced by pre-cooked rind emulsions, commercial collagen gels, and connective tissue powders. However, where a Codex designation is in use, Salzstoß at the specified inclusion is mandatory. No substitution is permitted except in the documented Schübling case [1][2].

1.4 The Burenwurst Connection and the South African Link

The Burenwurst is the product in which the Salzstoß has its most culturally and technically instructive role. It is the defining sausage of the Wiener Wurstelstand, which achieved UNESCO intangible cultural heritage status in 2024. One Viennese food source states the relationship directly: Das geschmackliche Geheimnis der Burenwurst ist der Salzstoß [20].

At 20 parts per 100 in the Codex formulation, the Salt Batch contribution to Burenwurst is substantial. The Austrian Food Ministry (BMLUK) documents the name origin explicitly: Burenwurst takes its name from the Boer War of 1899 to 1902, during which the sausage gained broad popularity in Vienna in solidarity with the Boers of South Africa [7]. The South African connection is therefore embedded in the name and history of the product that most depends on Salt Batch as a functional ingredient. A document about connective tissue processing written for Lagos operations, drawing on Austrian Salzstoß methodology and its South African naming origin, sits at the intersection of these two histories.

The Burenwurst is a dual system: a myofibrillar matrix formed by the Grundbrat at Phase 1, combined with a collagen particle system delivered by the Salt Batch at Phase 2. The two systems are structurally distinct. The myofibrillar matrix provides continuous binding and water retention. The collagen particles provide mechanical bite resistance, moisture distribution at the particle surface, and flavour release from partial gelatinisation during scalding. Neither system can substitute for the other [7][17].

1.5 System Architecture: Three Functional Raw Materials

The processing system described in this document is built on three distinct functional raw materials, each manufactured in advance as a frozen block and used as an ingredient at the sausage production stage:

• The Salt Batch (Salzstoß): hydrated fibrous collagen, paddle mixed, not bowl cut. Contributes bite, partial gelatin, and textural structure to Bruhwurst products. Used in products where collagen particle character is desired in the finished texture. This is the classical Austrian method.
• The HeatCut Salt Batch (Heißschnitt-Salzstoß): pre-cooked, bowl-cut collagen paste from old nomadic West African cattle. Contributes gelatin, water binding, and emulsion structure. Used as a functional binder in all sausage types produced from this raw material.
• The Fat Emulsion: pre-emulsified fat in a protein-stabilised collagen matrix, manufactured separately from three possible fat sources: chicken skin, varket (rendered sheep tail fat), or vegetable fat. Contributes pre-emulsified fat and supplementary gelatin to fine emulsion products.

These three materials are manufactured separately and held as frozen blocks. They are never combined during manufacture. They meet for the first time at the sausage production stage, where each contributes its specific function to the finished product matrix.

1.6 Why Fat Must Be Considered Separately: Availability and Religious Requirements

The choice of fat source for the fat emulsion is not primarily a cost decision, although cost is a factor. It is fundamentally a question of what is available in a given operating environment and what is permissible under the religious requirements of the market being served.

In the Lagos operating environment, pork fat is not available as a routine raw material and is excluded entirely for a Halaal-certified operation serving a predominantly Muslim market. Beef fat from the nomadic cattle supply is available but is extremely lean: the Bokolo and Sokoto Gudali cattle that arrive at Agege Abattoir after long nomadic grazing have very little subcutaneous or intermuscular fat. What fat they carry is often oxidised from warm carcass delivery and must be rejected on smell. A reliable, consistent fat source for emulsion manufacture cannot be built on this supply [8][12].

Chicken fat and chicken skin are available, consistent, and Halaal-certifiable. Varket, the rendered fat from the tail of indigenous fat-tailed sheep breeds of southern Africa and the broader African sheep tradition, is Halaal, available in markets where fat-tailed breeds are slaughtered, and has specific functional properties that make it an interesting fat source for emulsion work. Vegetable fat, specifically sunflower oil or similar, is available everywhere, is suitable for vegetarian and vegan product lines, and is Halaal by default.

The fat emulsion section of this document therefore provides recipes and methods for all three fat sources, and within each, for two functional scenarios: with SPI (soy protein isolate), starch, and phosphate available, and with only salt, sodium bicarbonate, and starch.

1.7 Why Old Nomadic Cattle Connective Tissue Cannot Be Processed as a Classical Salt Batch

The classical Willi Wurm Salt Batch method works because the connective tissue from European cattle used in Austrian sausage production contains predominantly immature, thermally labile divalent crosslinks. These crosslinks respond to salt and water: the fibres swell, soften at the surface, and integrate into the myosin gel matrix during scalding, contributing both bite and partial gelatin to the finished product [5].

The Bokolo and Sokoto Gudali cattle at Agege Abattoir are mature, nomadic animals. Their connective tissue is dominated by mature, trivalent pyridinoline crosslinks: hydroxylysyl pyridinoline (HP) and lysyl pyridinoline (LP), formed through lysyl oxidase-mediated oxidative deamination followed by non-enzymatic condensation. These crosslinks are non-reducible and heat-stable. Total collagen in old nomadic cattle trim is 4.0 to 7.0 percent of wet weight, compared to 1.5 to 2.5 percent in young feedlot cattle. The insoluble crosslinked collagen fraction is approximately 4 to 6 times higher [1][5][11].

If the classical Willi Wurm method is applied to this material without pre-heating, the result is a poorly hydrated, poorly conditioned material that does not soften on cooking, produces hard gristle-like particles in the finished sausage, disrupts the myosin emulsion matrix, and contributes nothing functionally useful to the product. The salt and water cannot penetrate the dense pyridinoline-crosslinked fibre bundles sufficiently to produce meaningful swelling [5][9].

Pre-heating at 75 degrees Celsius for 20 to 25 minutes initiates partial surface denaturation of the collagen, reducing the effective crosslink barrier at the fibre surface and making the material processable. After pre-heating and cooling, bowl cutting with salt and ice water at below 12 degrees Celsius disperses the softened collagen to a smooth paste. This paste is the HeatCut Salt Batch. It is not a variation of the classical method. It is a distinct product with a different physical form, different functional properties, and a different role in the sausage system [2][3][10].

The two products are complementary, not interchangeable. For operations in Austria or South Africa working with young pork or young beef, the classical Salt Batch is the correct approach. For operations working with old nomadic Zebu-type cattle in West Africa and comparable supply chains in Mexico, Brazil, or Argentina, the HeatCut Salt Batch is the correct approach. Both are documented in this guide.

1.8 What Each System Contributes to the Sausage

The Salt Batch contributes fibrous collagen particles that remain structurally intact inside the sausage matrix. On cooking at Bruhwurst temperatures of 72 to 78 degrees Celsius core, the outer surface of each particle partially gelatinises, binding it into the surrounding myosin matrix and releasing flavour compounds. The interior retains native collagen structure, delivering bite resistance. This dual state, gelatinised exterior and native interior, is the textural identity of a correctly made Burenwurst [5][17].

The HeatCut Salt Batch contributes dispersed collagen in paste form. At the sausage bowl cut stage it integrates into the myofibrillar matrix as fine particles that are already partially pre-conditioned. On cooking it contributes gelatin, water binding through gel formation, and structural cohesion. It does not deliver the bite character of the classical Salt Batch because the fibrous structure has been disrupted by bowl cutting. Its contribution is to yield, cohesion, and emulsion stability rather than textural bite [2][3].

The Fat Emulsion contributes pre-emulsified fat in a protein-stabilised matrix. In fine emulsion products such as vienna and frankfurter, fat that arrives pre-emulsified is more stable in the sausage bowl cutter than fat added raw, because the protein film around each fat particle is already established before the bowl cut begins. The fat emulsion also contributes its own small gelatin fraction from the collagen in the skin or from the protein matrix around the fat particles [10].

Why two separate frozen blocks are better than one combined material:

The Salt Batch and HeatCut Salt Batch are kept as separate frozen blocks because they serve different functional purposes and are used at different inclusion levels in different products. The classical Salt Batch with its fibrous structure is used in products where bite is desired: Burenwurst, Waldviertler, coarse sausages. The HeatCut Salt Batch is used as a universal binder and gelatin contributor across all product types made from old cattle raw material. Combining them during manufacture would either require bowl cutting the Salt Batch (destroying its fibrous structure) or leaving the HeatCut material poorly processed. Keeping them separate preserves the functional identity of each and allows precise formulation of each product independently.

2. Processing Methods

2.1 Salt Batch (Salzstoß): Classical Austrian Method

This method is attributed to Willi Wurm and documented from his apprenticeship [25]. It applies to young European cattle or pork connective tissue with predominantly immature collagen crosslinks.

2.1.1 Formulation, per 10 kg batch (percentages on raw connective tissue mass)

Ingredient	Amount	% of CT mass	Function
Connective tissue (tendons, epimysium, perimysium, fascia)	10.0 kg	100%	Collagen source. Structure and bite in finished sausage.
Salt (NaCl)	200 to 250 g	2.0 to 2.5%	Preservation. Limited collagen surface conditioning. Dissolved in water before adding.
Water (chilled)	2.0 to 4.0 kg	20 to 40%	Hydration medium. Enables swelling and salt distribution.
Water-soluble phosphate (optional, modern adaptation)	30 to 50 g	0.3 to 0.5%	Raises pH. Promotes fibre swelling. Not part of historical Codex definition.

2.1.2 Process

1. Trim connective tissue. Separate tendons, epimysium, perimysium, and fascial tissue from the lean muscle fraction. Reject any material showing rancid or putrid odour.
2. Mince through 5 to 20 mm plate (initial particle size for conditioning).
3. Dissolve salt (and phosphate if used) in chilled water before adding to tissue.
4. Add salt solution to minced tissue. Mix in paddle mixer only. No bowl cutter at any stage. Mix 10 to 20 minutes until all particles are uniformly coated and no dry material remains.
5. Rest covered at 0 to 4 degrees Celsius for 6 to 24 hours.
6. Before use: wolf to 2 to 3 mm. Add to sausage batter at Phase 2, after the Grundbrat is leimig und glatt.

The bowl cutter must never be used on Salt Batch. It would reduce the material to paste, destroying the fibrous structure that delivers bite in the finished product [25].

2.2 HeatCut Salt Batch (Heißschnitt-Salzstoß): Lagos Adaptation

This method applies to old nomadic cattle (Bokolo, Sokoto Gudali, and comparable Zebu-type breeds) with high pyridinoline crosslink density. It was developed for operations working with the raw material conditions documented at Agege Abattoir, Lagos, and comparable West African supply chains. The same principle applies to cull cow operations in Mexico, Brazil, and Argentina [1][2][3].

2.2.1 Formulation, Full System (SPI, starch, phosphate available)

10 kg batch. All percentages on total batch weight.

Ingredient	Amount	% batch	Function
Pre-minced tendon and fascia	5.5 kg	55.0%	Collagen source
Ice water	3.5 kg	35.0%	Hydration and temperature control
Salt (NaCl or cure salt)	180 g	1.8%	Protein extraction; preservation. Add first.
Sodium bicarbonate	20 g	0.2%	pH adjustment; assists myosin extraction
Phosphate (STPP)	30 g	0.3%	Protein solubilisation; water binding
SPI	300 g	3.0%	Emulsification; water binding
Cassava starch	200 g	2.0%	Water binder; secondary fat stabilisation on cooking
Total	9.73 kg	~100%

2.2.2 Formulation, Limited System (salt, sodium bicarbonate, starch only)

10 kg batch. All percentages on total batch weight.

Ingredient	Amount	% batch	Function
Pre-minced tendon and fascia	6.5 kg	65.0%	Collagen source
Ice water	3.0 kg	30.0%	Hydration and temperature control
Salt (NaCl or cure salt)	180 g	1.8%	Protein extraction; preservation. Add first.
Sodium bicarbonate	20 g	0.2%	pH adjustment; modest protein extraction aid
Cassava starch	200 g	2.0%	Water binder; cooking yield improvement
Total	9.90 kg	~100%

2.2.3 Process (both systems)

• Separate all incoming trim into lean fraction and connective tissue fraction by manual trimming. Reject any fat or connective tissue showing oxidised or putrid odour.
• Pre-mince connective tissue fraction through 13 to 20 mm plate.
• Pre-cook at 75 degrees Celsius for 20 to 25 minutes. This thermally weakens the crosslinked collagen structure, substantially reducing bowl cutter resistance. Full gelatinisation of mature crosslinked collagen is not achieved at this temperature, but the material is structurally softened and processable [10].
• Cool to below 10 degrees Celsius within 90 minutes. Do not hold at ambient temperature. Pre-cooked material not processed within 24 hours must be discarded.
• Bowl cut. Load pre-cooked, chilled material into bowl cutter. Begin on high speed. Add salt first. Allow 1 minute extraction. Add sodium bicarbonate and phosphate (if used). Add ice water progressively. Add SPI (if used), then starch. Cut to smooth, glossy paste.
• Temperature critical control point: do not exceed 12 degrees Celsius throughout the bowl cut. Above this threshold myosin begins to denature before the emulsion matrix is set [10].
• Pack into trays or moulds. Freeze to minus 5 to minus 8 degrees Celsius.
• Before use: mince frozen blocks through 4.5 mm plate. Incorporate at 10 to 20 percent of finished sausage formulation depending on product type. Do not exceed 20 percent without a cooking trial [2][4].

Label every frozen block: date, batch number, full or limited system, plain NaCl or cure salt. The distinction matters for salt accounting at the sausage production stage.

2.2.4 Functional ingredient roles: what phosphate, SPI, and starch each contribute

Phosphate (STPP) at 0.3 percent raises pH and increases the net negative charge on protein structures, improving myosin solubilisation and water binding. The effect is substantially greater than sodium bicarbonate alone. Hamm and Neraal (1977) document the enzymatic hydrolysis behaviour of polyphosphate in comminuted meat systems [13].

SPI at 3.0 percent provides the primary emulsification function. Soy protein isolate is a soluble functional protein that adsorbs at the fat-water interface during bowl cutting, forming a protein film around dispersed fat particles and stabilising the emulsion. TVP (textured vegetable protein) is an insoluble, extruded, denatured product with no surface activity at the fat-water interface and cannot substitute for SPI in this role [Carballo et al., 1996].

Cassava starch at 2.0 percent gelatinises during cooking at 58 to 70 degrees Celsius and forms a gel network that binds free water and contributes to slice integrity and yield. It provides secondary stabilisation of fat particles during cooking by forming a gel network around them. It does not improve fat emulsion stability during the bowl cut [2][3].

Sodium bicarbonate at 0.2 percent raises pH modestly (approximately 0.2 to 0.3 pH units) and assists myosin extraction by increasing net negative charge on protein filaments. The effect is useful but modest compared to polyphosphate. It is the best available pH adjustment agent when phosphate is not available [10].

3. Fat Emulsion Systems

3.1 Overview

The fat emulsion is a pre-emulsified fat base manufactured separately from the Salt Batch and HeatCut Salt Batch and held as a frozen block for use in sausage production. Its purpose is to deliver fat to fine emulsion sausages in a pre-stabilised form that is more stable in the sausage bowl cutter than fat added raw. The principle is documented in the CT Processing Guide: fat incorporated inside a collagen-protein paste matrix during bowl cutting is more stable than fat added as a separate raw ingredient [10].

Three fat sources are documented here: chicken skin, varket (rendered sheep tail fat), and vegetable fat (sunflower or canola oil). Each has a different fatty acid profile, different physical handling characteristics, and different availability across operating environments.

3.2 Fat Source Identification

3.2.1 Chicken skin

Chicken skin carries 30 to 40 percent lipid by wet weight, distributed in adipocytes embedded in the dermal connective tissue matrix. The fat is predominantly unsaturated, with a melting point well below processing temperatures. The collagen in chicken skin is Type I and Type III with a low pyridinoline crosslink density, thermally labile at normal cooking temperatures, and will partially gelatinise on cooking, contributing gelatin to the finished product matrix [5]. Chicken skin is Halaal-certifiable and broadly available in Lagos and comparable West African urban centres.

3.2.2 Varket: rendered sheep tail fat

Varket is the rendered fat from the tail of indigenous fat-tailed sheep breeds of southern Africa: the Namaqua Afrikaner, Ronderib Afrikaner, Blackhead Persian, Van Rooy, and Damara, among others. These breeds are distributed across South Africa, Namibia, Botswana, and comparable arid-zone grazing systems. The Khoikhoi people and their descendants have used this fat as a cooking and lamp oil for centuries: the term varket in Afrikaans refers specifically to this rendered tail fat, and its historical use as lamp oil (lampolie) is the origin of the colloquial reference [8].

Rendered sheep tail fat (varket) does not solidify at room temperature because the tail fat has a lower melting point than body fat: the tail is exposed to cold more than the body interior, and the fat has evolved a lower saturation to remain mobile as an energy reserve. This gives it a buttery, semi-liquid texture at room temperature and a high smoke point when rendered [3-reference from search]. It is fully Halaal. It is available wherever fat-tailed sheep breeds are slaughtered. In Nigeria and West Africa, comparable fat-tailed breeds exist, and the same product can be obtained from local slaughter.

The fatty acid profile of sheep tail fat is distinct from both pork lard and chicken fat. It is higher in oleic acid (C18:1) and lower in linoleic acid (C18:2) than chicken fat, giving it greater oxidative stability. This is relevant for shelf life of the emulsion block [6-reference from search on sheep tail fat meatballs].

3.2.3 Vegetable fat (sunflower or canola oil)

Sunflower oil and canola oil are liquid at all processing and storage temperatures. This creates a fundamentally different emulsification challenge from solid or semi-solid animal fats. Liquid oil cannot be firmed by partial freezing. The emulsion system therefore relies entirely on protein stabilisation to hold the oil in a dispersed state within the paste matrix. Without SPI or a comparable functional protein, a liquid oil emulsion block is not stable. The limited system (salt and sodium bicarbonate only) is not recommended for vegetable oil emulsion blocks. SPI and starch are required for a functional result.

Sunflower and canola oils are Halaal by default. They are suitable for vegetarian and vegan product lines. They are available in every operating environment. Sunflower oil from South Africa is among the highest-quality available globally. Canola oil has a lower saturated fat content than sunflower and a higher oleic acid content in high-oleic varieties, which improves oxidative stability [Frankel, 1998].

3.3 Fat Emulsion Recipes

3.3.1 Chicken skin fat emulsion, full system (SPI plus cassava starch)

10 kg batch. Percentages on total batch weight.

Ingredient	Amount	%	Notes
Chicken skin, chilled or partially frozen	6.8 kg	68.0%	0 to minus 3 C before mincing
Ice water	2.5 kg	25.0%	Add progressively during bowl cut
Salt (NaCl or cure salt)	180 g	1.8%	Add first. Allow 1 min extraction.
Sodium bicarbonate	20 g	0.2%	After salt
SPI	280 g	2.8%	Primary emulsifier. Add after first water addition.
Cassava starch	180 g	1.8%	Water binder. Add after SPI.

3.3.2 Chicken skin fat emulsion, limited system (cassava starch, no SPI)

10 kg batch. Temperature control is the only emulsion stabiliser in this system.

Ingredient	Amount	%	Notes
Chicken skin, chilled or partially frozen	6.9 kg	69.0%	Must be partially frozen going in
Ice water	2.7 kg	27.0%	Higher than full system to compensate for absent SPI
Salt (NaCl or cure salt)	180 g	1.8%	Add first.
Sodium bicarbonate	20 g	0.2%	After salt
Cassava starch	200 g	2.0%	Water binder. Add after water is in.

3.3.3 Varket (sheep tail fat) fat emulsion, full system (SPI plus cassava starch)

10 kg batch. Varket is semi-liquid at room temperature. Handle at minus 5 to minus 8 C (firm but not rock-hard) before and during bowl cutting.

Ingredient	Amount	%	Notes
Rendered varket (sheep tail fat), chilled firm	6.5 kg	65.0%	Chill to minus 5 to minus 8 C before bowl cut. More firm than chicken skin fat.
Ice water	2.7 kg	27.0%	Add progressively
Salt (NaCl or cure salt)	180 g	1.8%	Add first.
Sodium bicarbonate	20 g	0.2%
SPI	280 g	2.8%	Primary emulsifier
Cassava starch	200 g	2.0%	Water binder
TG enzyme (optional)	As per supplier spec	0.1 to 0.3%	Add at sausage stage, not in emulsion base

3.3.4 Varket fat emulsion, limited system (salt and sodium bicarbonate only)

Varket is more stable than chicken fat in the limited system because its fatty acid profile is less unsaturated, giving it greater oxidative stability and a slightly higher effective melting point. However strict temperature control remains mandatory.

Ingredient	Amount	%	Notes
Rendered varket, firmed to minus 6 C	6.7 kg	67.0%
Ice water	3.0 kg	30.0%
Salt	180 g	1.8%
Sodium bicarbonate	20 g	0.2%

3.3.5 Vegetable fat emulsion, full system (SPI plus cassava starch)

Liquid oil at all processing temperatures. SPI is not optional in this system: without SPI, the oil will separate. The limited system is not viable for vegetable oil emulsion manufacture.

Ingredient	Amount	%	Notes
Sunflower or canola oil	5.0 kg	50.0%	Add slowly during bowl cut, not all at once
Ice water	3.5 kg	35.0%
Salt (NaCl)	180 g	1.8%	Add first with SPI
Sodium bicarbonate	20 g	0.2%
SPI	800 g	8.0%	Higher SPI needed for liquid oil. Primary emulsifier.
Cassava starch	400 g	4.0%	Essential for gel structure to hold liquid oil particles

The vegetable oil emulsion requires SPI. Without it the oil cannot be stabilised as a frozen block for use in sausage production. If SPI is not available, add vegetable oil directly to the sausage bowl cutter with SPI at the sausage production stage rather than attempting to pre-emulsify it.

3.3.6 Fat emulsion: process (all animal fat variants)

1. Mince chilled or partially frozen chicken skin through 8 mm plate. For varket: portion rendered fat chilled to minus 5 to minus 8 C. Do not mince varket.
2. Freeze minced chicken skin to minus 6 to minus 8 C. This firms the fat in place for controlled bowl cutting. Do not skip this step.
3. Bandsaw frozen block if needed. Regrind through 8 mm from frozen state.
4. Apply salt and sodium bicarbonate dry to the freshly remined material. Mix briefly to distribute.
5. Bowl cut. High speed. Add ice water progressively. Add SPI dry (full system). Add cassava starch dry. Cut to smooth, glossy paste.
6. Temperature: do not exceed 12 degrees Celsius. Hard stop in the limited system. Small margin in the full system from SPI protein film.
7. Pack and freeze to minus 6 C. Label: date, batch number, fat source, system (full or limited), plain NaCl or cure salt.

No pre-cooking is used for fat emulsion manufacture. Pre-cooking chicken skin or varket would render the fat before emulsification. The freeze-regrind sequence replaces pre-cooking for fat source materials.

3.3.7 Fat emulsion: vegetable oil process

For vegetable oil, the bowl cut sequence differs because the oil is liquid. Load ice water and SPI into the bowl cutter first. Dissolve salt in a portion of the ice water and add with the SPI. Start cutting. Add oil slowly in a thin stream during cutting, not all at once. Add starch when half the oil is incorporated. Continue cutting until the emulsion is smooth and white. The product will not freeze solid but will firm significantly at minus 6 C due to the starch gel and SPI protein network. Mince through 4.5 mm before use if needed, or add directly to the sausage bowl cutter in measured portions.

4. Product Formulations with Salt Batch and HeatCut Salt Batch

4.0 Philosophy of the Two Recipe Options

Every product formulation in this section is presented in two versions. The distinction between them is a matter of principle, not just ingredient availability.

The first version is the full-ingredient system. It uses the complete range of available functional ingredients: SPI, cassava starch, phosphate, salt, and sodium bicarbonate. The conceptual emphasis in this version is not to produce a hydrocolloid-dominated recipe in which gels, gums, and stabilisers carry the structure. The aim is a traditional, quality recipe in which myosin binding dominates. The functional ingredients support and protect the myosin system. They do not replace it. Carrageenan and LBG appear in fine emulsion products in modest quantities to assist water binding and gel firmness, but the primary structural work is done by extracted myofibrillar proteins. This distinction matters on the production floor: a recipe that relies on hydrocolloid gel for its structure will fail differently and for different reasons than a recipe built on myosin. Troubleshooting, raw material evaluation, and quality control all depend on understanding which system is carrying the structure.

The second version is the salt-and-sodium-bicarbonate system. This version assumes that only two functional ingredients are available: NaCl and sodium bicarbonate. Both are universally available across sub-Saharan Africa. No SPI, no starch, no phosphate, no hydrocolloid. The recipe in this version relies entirely on myosin extraction by salt, partial pH adjustment by sodium bicarbonate, and the gelatin contribution from the HeatCut Salt Batch. It is a leaner, more demanding system that requires strict temperature discipline in the bowl cutter and conservative inclusion levels. It is not a degraded version of the full recipe. It is a different operational reality, documented honestly with its limitations stated.

Milk powder could be incorporated into the limited system and would improve emulsion stability and water binding measurably, because the casein in milk powder has genuine surface activity at fat-water interfaces. This option is documented in the CT Processing Guide (Section 16). It is not incorporated here because the practical experience from production will determine whether it is needed. If bowl cut temperature is controlled and inclusion levels are conservative, the salt-and-sodium-bicarbonate system produces a functional sausage without milk powder. Milk powder addition is held as a documented option for a future version of these formulations if field experience shows it is necessary.

4.0.1 A note on the Bambara groundnut as a future SPI replacement

The Bambara groundnut (Vigna subterranea L. Verdc.) is one of the most significant and widely cultivated legumes in West Africa, deeply embedded in the food culture of Nigeria, Ghana, and the broader Sahelian region. Its protein content ranges from 19 to 26 percent of dry weight in whole seed, and from 81 to 93 percent in the protein isolate fraction [29][30]. Bambara groundnut protein isolate (BGPI) displays thermal stability and solubility comparable to soy protein isolates, and the defatted flour and protein concentrate fractions show measurable emulsifying activity index and emulsifying stability index values in published trials [29][31].

The anti-nutritional factors (ANFs) in raw Bambara groundnut, including trypsin inhibitors, tannins, phytates, and oligosaccharides such as raffinose and stachyose, are substantially reduced by soaking and boiling. Boiling for 60 minutes reduces tannin content by up to 99 percent, increases in vitro protein digestibility to 87 to 89 percent, and reduces oligosaccharide levels by 50 to 59 percent compared to raw seed [27]. Autoclaving is more effective than boiling for ANF elimination but may reduce emulsifying functionality because high-temperature protein denaturation reduces interfacial activity [30][33].

The practical consequence for sausage production is that properly processed Bambara groundnut flour or concentrate, cooked to the temperature required for ANF elimination and then dried or used wet, may function as a partial or full substitute for SPI in the limited-ingredient system. This is a genuinely promising direction that deserves formal investigation. However, the processing conditions that eliminate ANFs and those that preserve emulsifying functionality are in tension: the optimal cooking temperature and duration for each outcome has not been established for meat emulsion applications specifically, and the available literature on BGPI functionality in meat systems is limited. This work is therefore left for a future document. The current guide retains only salt and sodium bicarbonate in the limited system, without Bambara groundnut, because the formulation logic must be grounded in tested practice rather than projected potential.

After each limited-system recipe in this section, a brief note is added indicating whether the addition of processed Bambara groundnut flour or concentrate alongside salt and sodium bicarbonate would be advisable based on the specific functional demands of that product. These notes are advisory and forward-looking, not prescriptive.

All formulations below are for 20 kg finished product batches. Scale proportionally. The HeatCut Salt Batch block (Section 2.2) and fat emulsion block (Section 3.3) are pre-made, frozen, and ready before production begins. Salt accounting follows Section 2.2 (both blocks contain 1.8% salt on block weight). For each product the following is stated: what goes up and by how much, what goes down and by how much, what is emulsified, what is ground and through which plate size.

4.1 SA Russian Sausage / Zambian Hungarian Sausage / Austrian Burenwurst

4.1.1 Product character

Coarse mix product. 8 mm grind mandatory. Bite and particle definition are the eating quality targets. The Salt Batch (classical method, Austrian origin) delivers the collagen particle bite characteristic of Burenwurst. The HeatCut Salt Batch delivers gelatin and water binding for the Lagos version. In an Austrian Burenwurst the Salt Batch at 20 percent is mandatory by Codex. In the Lagos Russian or Hungarian sausage the HeatCut Salt Batch is the correct choice. In both options the binding system is myosin-dominant. The small phosphate addition in Option 1 assists myosin extraction and is not present to drive a hydrocolloid gel structure.

4.1.2 Option 1: Full ingredient system (SPI, starch, phosphate available)

20 kg batch. Myosin binding dominates. Phosphate supports protein extraction. SPI assists emulsion stability of the fat block. No carrageenan or LBG: this is a coarse product and gel formers are not required.

Ingredient	% w/w	Qty (g)	Notes
Lean beef trim (80/20)	50.0%	10,000	8 mm grind. Minus 1 to 2 C.
Lean pork trim (80/20)	20.0%	4,000	8 mm grind with beef.
Hard fat trim (partially frozen)	13.0%	2,600	8 mm grind. Minus 3 to 0 C.
HeatCut Salt Batch (4.5 mm from frozen)	8.0%	1,600	Add at mixing after grinding. What goes UP: gelatin, water binding, yield. What goes DOWN: raw collagen trim.
Fat emulsion block (4.5 mm from frozen)	5.0%	1,000	Optional. What goes DOWN: raw fat trim (reduce by 5%).
Salt (additional)	1.66%	332	Total target 1.8%. Blocks at 13% combined contribute 0.23%.
Sodium bicarbonate	0.20%	40
STPP	0.20%	40	Dissolve in 50 ml cold water.
Sodium nitrite (hot-smoked variant only)	0.015%	3	Confirm NAFDAC maximum.
Spice blend (paprika/garlic/marjoram/caraway)	~0.80%	~160	See Section 4.7.

What is emulsified: HeatCut Salt Batch and fat emulsion block only. Lean and fat trim are ground. Plate: 8 mm all trim. 4.5 mm frozen blocks before blending.

4.1.3 Option 2: Salt and sodium bicarbonate only

20 kg batch. Salt extracts myosin. Sodium bicarbonate adjusts pH. The HeatCut Salt Batch is the only additional functional system. Fat trim is added raw; it is not pre-emulsified. Temperature at mixing must not exceed 4 C.

Ingredient	% w/w	Qty (g)	Notes
Lean beef trim (80/20)	52.0%	10,400	8 mm grind. Minus 1 to 2 C.
Lean pork trim (80/20)	20.0%	4,000	8 mm grind.
Hard fat trim (partially frozen)	15.0%	3,000	8 mm grind. Added raw. Hard fat only.
HeatCut Salt Batch (4.5 mm from frozen)	8.0%	1,600	As Option 1.
Salt (additional)	1.66%	332	Total target 1.8%. Block at 8% contributes 0.144%.
Sodium bicarbonate	0.20%	40
Sodium nitrite (hot-smoked variant only)	0.015%	3	Confirm NAFDAC maximum.
Spice blend	~0.80%	~160	See Section 4.7.

Bambara groundnut note: For this coarse mix product, properly processed Bambara groundnut flour or concentrate (cooked to eliminate ANFs, dried and milled) added at 3 to 5% replacing an equal weight of lean trim is advisable if available. The water and oil absorption capacity of Bambara flour contributes to water binding and fat retention in a coarse mix, partially compensating for absent SPI. The starch fraction additionally aids cooking yield. Emulsifying activity of heat-treated Bambara flour is lower than SPI, but in a coarse product that does not require fat droplet stabilisation during bowl cutting, water and oil absorption is the more relevant function [29][31]. This is a future experiment, not a current formulation recommendation.

4.2 SA Vienna / American Frankfurter / Wiener

4.2.1 Product character

Fine emulsion product. Bowl cutter is mandatory. Pre-grind through 4.5 mm before bowl cutting. Temperature below 12 C throughout the bowl cut is non-negotiable in both options. The binding system is myosin-dominant. In Option 1 the SPI, starch, carrageenan, and LBG support the myosin matrix rather than replace it. Their combined level is modest; the structural work is done by extracted myofibrillar proteins.

4.2.2 Option 1: Full ingredient system

20 kg batch.

Ingredient	% w/w	Qty (g)	Notes
Lean beef trim (80/20)	45.0%	9,000	Pre-grind 4.5 mm. Minus 1 to 2 C.
Lean pork trim (80/20)	20.0%	4,000	Pre-grind 4.5 mm with beef.
Fat emulsion block (4.5 mm from frozen)	10.0%	2,000	Add to bowl cutter after salt extraction. What goes UP: pre-emulsified fat and gelatin.
HeatCut Salt Batch (4.5 mm from frozen)	10.0%	2,000	Add after fat emulsion. What goes UP: gelatin, water binding, yield. What goes DOWN: lean trim (~10%).
Ice water	7.0%	1,400	Add progressively during bowl cut.
Salt (additional)	1.62%	324	Total target 1.8%. Blocks at 20% combined contribute 0.36%.
STPP	0.30%	60	Dissolve in portion of ice water.
SPI	2.50%	500	Add dry after salt extraction. Supports myosin matrix.
Cassava starch	2.00%	400	Add dry after SPI.
Kappa carrageenan	0.30%	60	Combine dry with LBG.
LBG	0.10%	20	Combine with carrageenan.
Sodium bicarbonate	0.20%	40
Spice blend	0.50%	100	White pepper, paprika, nutmeg, mace, cardamom. See Section 4.7.

Bowl cut sequence: lean meat -> STPP+salt (1 min extraction) -> fat emulsion (slowly) -> HeatCut Salt Batch -> ice water in stages -> SPI -> starch -> carrageenan+LBG -> bicarb -> spices. Final paste below 12 C. Stuff 20 to 22 mm casing. Cook to 72 C core. Cold shock immediately.

4.2.3 Option 2: Salt and sodium bicarbonate only

20 kg batch. No SPI, no starch, no phosphate, no hydrocolloids. Myosin extracted by salt is the sole emulsion stabiliser during the bowl cut. Temperature control is the only tool available to protect the emulsion. The fat emulsion block in this option uses the limited system (Section 3.3.2 or 3.3.4). Fat inclusion is reduced from 10% to 8% to lower the demand on the myosin emulsion system.

Ingredient	% w/w	Qty (g)	Notes
Lean beef trim (80/20)	48.0%	9,600	Pre-grind 4.5 mm. Minus 1 to 2 C.
Lean pork trim (80/20)	20.0%	4,000	Pre-grind 4.5 mm with beef.
Fat emulsion block, limited system (4.5 mm from frozen)	8.0%	1,600	Add after salt extraction. Limited system fat block only.
HeatCut Salt Batch, limited system (4.5 mm from frozen)	10.0%	2,000	Add after fat emulsion.
Ice water	7.0%	1,400
Salt (additional)	1.64%	328	Total target 1.8%. Blocks at 18% combined contribute 0.324%.
Sodium bicarbonate	0.20%	40
Spice blend	0.50%	100	See Section 4.7.

Temperature 12 C is a hard stop in this option. There is no margin from SPI protein film around fat droplets. If fat separation appears in the cooked product, reduce fat emulsion inclusion to 5% and investigate bowl cut temperature. Do not attempt to correct separation by adding more HeatCut Salt Batch.

Bambara groundnut note: For fine emulsion products, processed Bambara groundnut protein isolate (BGPI), extracted at conditions that preserve emulsifying activity rather than maximum ANF elimination, is the most relevant form if available. BGPI protein content of 81 to 93% and pH-dependent solubility comparable to SPI are documented [29][30]. However, the tension between ANF elimination temperature and preservation of emulsifying functionality is critical for this product. High-temperature processing reduces emulsifying properties of Bambara protein [30][33]. For a vienna or frankfurter in the limited system, a conservatively heat-treated BGPI at 2 to 2.5% replacing an equal weight of lean trim is worth investigating as a future step. The practical determination of the correct processing temperature and duration for this application requires controlled production trials that have not yet been conducted.

4.3 Fresh Sausage (Braai Sausage)

Coarse mix product. 8 mm grind only. No bowl cutter. The fat emulsion block is not used in fresh braai sausage: it would smear between 8 mm particles and close the open coarse texture that defines this product. The HeatCut Salt Batch only. Myosin binding is the primary system in both options. This product is the simplest in the range and the difference between Option 1 and Option 2 is minimal.

4.3.1 Option 1: Full ingredient system

20 kg batch.

Ingredient	% w/w	Qty (g)	Notes
Lean beef trim (85/15)	62.0%	12,400	8 mm grind. Minus 1 to 2 C.
Hard beef back fat (partially frozen)	16.0%	3,200	8 mm grind. Partial freeze prevents smear.
Beef plate/flank (high collagen)	10.0%	2,000	8 mm grind.
HeatCut Salt Batch (4.5 mm from frozen)	7.0%	1,400	Add at mixing. What goes UP: gelatin, juiciness, yield. What goes DOWN: high-collagen trim (~7%).
Salt (additional)	1.47%	294	Total target 1.6%. Block at 7% contributes 0.126%.
Sodium bicarbonate	0.20%	40
STPP	0.20%	40	Dissolve in cold water.
Spice blend (coriander dominant)	~0.80%	~160	Coriander at 8.0 g/kg is dominant. Do not reduce. See Section 4.7.

4.3.2 Option 2: Salt and sodium bicarbonate only

20 kg batch. For fresh braai sausage the difference from Option 1 is minor. STPP is removed. The binding system is salt-extracted myosin from the lean trim. This product does not require bowl cutting and does not have a fat emulsion stability challenge.

Ingredient	% w/w	Qty (g)	Notes
Lean beef trim (85/15)	62.5%	12,500	8 mm grind.
Hard beef back fat (partially frozen)	16.5%	3,300	8 mm grind.
Beef plate/flank (high collagen)	10.0%	2,000	8 mm grind.
HeatCut Salt Batch (4.5 mm from frozen)	7.0%	1,400	As Option 1.
Salt (additional)	1.47%	294	Total target 1.6%.
Sodium bicarbonate	0.20%	40
Spice blend	~0.80%	~160	See Section 4.7.

Bambara groundnut note: For fresh braai sausage, the addition of cooked and dried Bambara groundnut flour at 3 to 5% alongside salt and sodium bicarbonate would be advisable primarily for its water and oil absorption capacity, which would improve cooking yield and juiciness. The emulsifying activity requirement is low for this product. This is likely the most straightforward Bambara groundnut application in the range and a good candidate for the first practical trial.

4.4 Mortadella

Fine emulsion product. Bowl cutter mandatory. Cooked to 72 to 75 C core in a water bath or steam oven. Must hold a clean slice with no fat or gelatin pockets. The HeatCut Salt Batch at 10 to 15 percent contributes meaningful gelatin that improves slice integrity. Myosin binding is the primary structural system in both options.

4.4.1 Option 1: Full ingredient system

20 kg batch. SPI, starch, and carrageenan support the myosin matrix at modest levels. The primary binder is myosin. Carrageenan at 0.30% contributes gel firmness on cooling without dominating the structure.

Ingredient	% w/w	Qty (g)	Notes
Lean pork trim (80/20)	50.0%	10,000	Pre-grind 4.5 mm.
Lean beef trim (80/20)	15.0%	3,000	Pre-grind 4.5 mm.
Fat emulsion block (4.5 mm from frozen)	10.0%	2,000	Add to bowl cutter after salt extraction.
HeatCut Salt Batch (4.5 mm from frozen)	12.0%	2,400	Add after fat emulsion. What goes UP: gelatin, slice integrity, yield. What goes DOWN: lean trim (~12%).
Ice water	5.0%	1,000	Add progressively.
Salt (additional)	1.58%	316	Total target 1.8%. Blocks at 22% combined contribute 0.396%.
STPP	0.30%	60
SPI	2.00%	400
Cassava starch	2.00%	400
Kappa carrageenan	0.30%	60
Black pepper (coarsely cracked)	0.30%	60	Classic mortadella inclusion.
Spice blend (white pepper, mace, nutmeg, garlic)	0.40%	80	See Section 4.7.

Do not exceed 15% HeatCut Salt Batch without a cooking trial. Above this level colour shifts slightly pale and texture approaches luncheon meat character.

4.4.2 Option 2: Salt and sodium bicarbonate only

20 kg batch. Reduce HeatCut Salt Batch from 12% to 10% and fat emulsion from 10% to 8% to reduce the functional load on the myosin system. Temperature control at 12 C in the bowl cut is a hard stop.

Ingredient	% w/w	Qty (g)	Notes
Lean pork trim (80/20)	52.0%	10,400	Pre-grind 4.5 mm.
Lean beef trim (80/20)	17.0%	3,400	Pre-grind 4.5 mm.
Fat emulsion block, limited system (4.5 mm from frozen)	8.0%	1,600	Add after salt extraction.
HeatCut Salt Batch, limited system (4.5 mm from frozen)	10.0%	2,000	Add after fat emulsion.
Ice water	6.0%	1,200
Salt (additional)	1.64%	328	Total target 1.8%. Blocks at 18% combined contribute 0.324%.
Sodium bicarbonate	0.20%	40
Black pepper (coarsely cracked)	0.30%	60
Spice blend	0.40%	80	See Section 4.7.

Bambara groundnut note: For mortadella in the limited system, processed BGPI at 1.5 to 2.0% as a partial emulsifier is the most relevant Bambara application. The documented emulsifying activity of Bambara concentrate fractions at alkaline pH is meaningful for a fine emulsion product [29][31]. However, the colour contribution of darker Bambara flour varieties may affect the pale slice appearance that is characteristic of mortadella. Cream or white variety Bambara protein concentrates, which have lighter colour, would be preferable for this application. This requires investigation before inclusion in a production formulation.

4.5 Bologna

Fine emulsion product. Functionally very similar to mortadella but finer in grind, more uniform in texture, no visible fat or spice inclusions, milder flavour. Produced in larger diameter casings (75 to 120 mm) and sliced cold. Myosin binding is the primary structural system in both options.

4.5.1 Option 1: Full ingredient system

20 kg batch.

Ingredient	% w/w	Qty (g)	Notes
Lean beef trim (80/20)	45.0%	9,000	Pre-grind 4.5 mm.
Lean pork trim (80/20)	20.0%	4,000	Pre-grind 4.5 mm with beef.
Fat emulsion block (4.5 mm from frozen)	10.0%	2,000	Add to bowl cutter after salt extraction.
HeatCut Salt Batch (4.5 mm from frozen)	10.0%	2,000	Add after fat emulsion. What goes UP: gelatin, water binding, yield, slice integrity. What goes DOWN: lean trim (~10%).
Ice water	7.0%	1,400
Salt (additional)	1.62%	324	Total target 1.8%. Blocks at 20% combined contribute 0.36%.
STPP	0.30%	60
SPI	2.00%	400
Cassava starch	2.00%	400
Kappa carrageenan	0.30%	60
Sodium nitrite (if applicable)	0.015%	3	Confirm regulatory maximum.
Spice blend (mild: white pepper, garlic, nutmeg, mace)	0.40%	80	Bologna is mild. See Section 4.7.

4.5.2 Option 2: Salt and sodium bicarbonate only

20 kg batch. Same reductions as mortadella Option 2. Fat emulsion reduced to 8%, HeatCut Salt Batch held at 10%. Temperature discipline at the bowl cutter is critical.

Ingredient	% w/w	Qty (g)	Notes
Lean beef trim (80/20)	47.0%	9,400	Pre-grind 4.5 mm.
Lean pork trim (80/20)	22.0%	4,400	Pre-grind 4.5 mm.
Fat emulsion block, limited system (4.5 mm from frozen)	8.0%	1,600	Add after salt extraction.
HeatCut Salt Batch, limited system (4.5 mm from frozen)	10.0%	2,000	Add after fat emulsion.
Ice water	7.0%	1,400
Salt (additional)	1.64%	328	Total target 1.8%. Blocks at 18% contribute 0.324%.
Sodium bicarbonate	0.20%	40
Sodium nitrite (if applicable)	0.015%	3
Spice blend	0.40%	80	See Section 4.7.

Bambara groundnut note: Same considerations as mortadella Option 2. Colour is equally important for bologna, which is a pale sliced product. White or cream variety Bambara protein concentrate at 1.5 to 2.0% is the direction to investigate. The emulsifying stability index of Bambara concentrate fractions at neutral to alkaline pH is documented in peer-reviewed literature as comparable to other legume protein concentrates [29][31]. Controlled production trials are required before incorporation into a production formulation.

4.6 Pressed Pork Ham / Pressed Chicken Ham

Restructured product. Whole muscle cubes, not mince. The HeatCut Salt Batch functions as a gelatin binder between muscle pieces, not as a fat delivery system. Vacuum tumbler strongly preferred. The fat emulsion block is not used: this is a binder-focused product.

4.6.1 Option 1: Full ingredient system

20 kg batch.

Ingredient	% w/w	Qty (g)	Notes
Lean pork shoulder or leg (cubed 3 to 4 cm) OR lean chicken thigh/breast (cubed)	75.0%	15,000	Do not mince. Cube only. Trim all visible connective tissue.
HeatCut Salt Batch (4.5 mm from frozen)	8.0%	1,600	Add to tumbler with brine. What goes UP: gelatin binder, slice integrity, yield. What goes DOWN: lean trim reduction (~8%).
Pork fat or chicken skin fat (diced 1 to 2 cm, partially frozen)	7.0%	1,400	Add to tumbler.
Ice water (brine basis)	8.0%	1,600	Prepare brine with all dissolved salts.
Salt (in brine)	1.66%	332	Total target 1.8%. Block at 8% contributes 0.144%.
Sodium nitrite (mandatory)	0.015%	3	Dissolve in brine. Confirm regulatory maximum.
STPP	0.30%	60	Dissolve in brine.
Kappa carrageenan	0.30%	60
Cassava starch	1.00%	200
Brown sugar	1.50%	300
Spice blend	~0.30%	~60	Mild. Black pepper, garlic, nutmeg.

Tumbler process: cube meat, prepare brine, load tumbler with all components, tumble under vacuum 30 to 45 minutes, rest 20 minutes, repeat. Mould or fill into fibrous casing. Steam cook to 72 C core. Cold shock. Chill minimum 8 hours before slicing.

4.6.2 Option 2: Salt and sodium bicarbonate only

20 kg batch. The primary binder between muscle pieces is myosin extracted during tumbling by salt, supplemented by gelatin from the HeatCut Salt Batch. Without STPP, myosin extraction during tumbling is reduced. Extend tumbling time to 45 to 60 minutes to compensate. Vacuum tumbling is more important in this option than in Option 1.

Ingredient	% w/w	Qty (g)	Notes
Lean pork shoulder or leg (cubed) OR lean chicken (cubed)	76.0%	15,200	Do not mince. Cube only.
HeatCut Salt Batch (4.5 mm from frozen)	8.0%	1,600	As Option 1.
Pork fat or chicken skin fat (diced, partially frozen)	7.0%	1,400
Ice water (brine basis)	7.5%	1,500
Salt (in brine)	1.66%	332	Total target 1.8%.
Sodium bicarbonate (in brine)	0.20%	40
Sodium nitrite (mandatory)	0.015%	3	Dissolve in brine. Confirm regulatory maximum.
Brown sugar	1.50%	300
Spice blend	~0.30%	~60	Mild. Black pepper, garlic, nutmeg.

Bambara groundnut note: For pressed ham in the limited system, processed Bambara groundnut is less advisable than in other products. The gelatin binder function between muscle pieces is best served by the HeatCut Salt Batch. The emulsification requirement is low. The main gap in Option 2 for pressed ham is STPP: its absence reduces myosin extraction during tumbling. Sodium bicarbonate provides modest pH adjustment but does not replicate phosphate. If Bambara protein concentrate becomes available, a small addition of 1 to 2% in the brine may assist water binding, but this is a lower priority than for the fine emulsion products.

4.7 Spice Specifications

Spice (g per kg finished product)	Braai	Vienna	Russian/Hungarian	Mortadella	Bologna	Pressed Ham	Burenwurst
Black pepper (cracked)	3.0	—	4.0 cracked	0.3	0.5	1.0	2.5
White pepper (fine)	1.0	2.5	—	0.5	1.0	—	1.0
Coriander (ground)	8.0	0.5	0.8	—	—	—	1.5
Garlic powder	0.8	0.4	1.5	0.5	0.5	0.5	1.0
Nutmeg (ground)	0.8	0.8	0.3	0.5	0.5	0.3	0.5
Paprika (sweet)	—	1.5	3.0	—	—	—	2.0
Marjoram (dried)	—	—	1.5	—	—	—	—
Caraway	—	—	0.8	—	—	—	—
Mace (ground)	—	0.3	—	0.5	0.5	—	0.3
Sugar	2.0	2.0	2.0	—	—	15.0	2.0

5. Summary Inclusion Table

5.1 Option 1: Full ingredient system (SPI, cassava starch, phosphate, salt, TVP available) — myosin binding dominant

TVP is used as a meat extender in the lean fraction only, not in the Salt Batch or HeatCut Salt Batch. It is not a substitute for SPI in emulsion manufacture. Typical TVP inclusion as lean extender: 5 to 10% of finished product replacing lean trim at equal weight.

Product	Salt Batch %	HeatCut Salt Batch %	Fat Emulsion %	TVP as lean extender %	Grinder plate
SA Russian / Zambian Hungarian / Burenwurst	0% (Lagos) / 20% (Austria)	8% (Lagos)	5%	5 to 8%	8 mm all trim; 4.5 mm frozen blocks
SA Vienna / Frankfurter / Wiener	0%	10%	10%	5 to 8%	4.5 mm pre-grind; bowl cutter
Fresh Braai Sausage	0%	7%	0%	0%	8 mm all trim
Mortadella	0%	12%	10%	5%	4.5 mm pre-grind; bowl cutter
Bologna	0%	10%	10%	5 to 8%	4.5 mm pre-grind; bowl cutter
Pressed Pork Ham / Chicken Ham	0%	8%	0%	0%	No mince; cube only

5.2 Option 2: Salt and sodium bicarbonate only — myosin binding with Bambara nut as future investigation

Product	Salt Batch %	HeatCut Salt Batch %	Fat Emulsion %	TVP as lean extender %	Notes
SA Russian / Zambian Hungarian	0%	8%	5% (varket or chicken skin)	5 to 8%	Reduce fat emulsion if separation occurs. Strict temperature control.
SA Vienna / Frankfurter	0%	10%	8% (chicken skin or varket)	5%	No SPI = no margin above 12 C. Hard stop.
Fresh Braai Sausage	0%	7%	0%	0%	No change from full system for this product.
Mortadella	0%	10%	8%	5%	Reduce HeatCut Salt Batch from 12% to 10%. Run cooking trial before moving higher.
Bologna	0%	10%	8%	5 to 8%	Same restrictions as vienna. Temperature critical.
Pressed Ham	0%	8%	0%	0%	No change from full system for this product.

Vegetable oil fat emulsion is not listed in the limited system column because it requires SPI. Without SPI, liquid oil cannot be stabilised as a frozen emulsion block. Add sunflower or canola oil directly to the bowl cutter at the sausage production stage in the limited system.

6. References

In-text citations are indicated by numbers in square brackets. All peer-reviewed sources are listed below with the specific claims they support in this document.

[1] Torrescano G, Sanchez-Escalante A, Gimenez B, Roncales P, Beltran JA (2003). Shear values and histological characteristics of semimembranosus muscle from cattle slaughtered at three ages. Meat Science 64: 71-77. (Collagen content 2 to 3 times higher in old cull cows; CT fraction 18 to 35% of trim weight in working muscles.)

[2] Pietrasik Z, Janz JAM (2009). Utilisation of pea flour, starch-rich and fibre-rich fractions in low fat bologna. Food Research International 43: 602-608. (Emulsion block manufacture; 20% sensory detection ceiling; hydrocolloid water binding; fat stabilisation; starch as secondary stabiliser.)

[3] Herrero AM, Cambero MI, Ordonez JA, de la Hoz L, Carmona P (2008). Raman spectroscopy study of the structural effect of microbial transglutaminase on meat systems. Food Chemistry 109: 25-32. (Pre-cooking CT; transglutaminase crosslinking; carrageenan and starch as stabilisers.)

[4] Brewer MS, Ikins WG, Harbers CAZ (1992). Toughness of beef muscles as affected by animal age. Journal of Food Science 57: 1290-1294. (Age-related collagen content and toughness; 20% CT emulsion ceiling validated.)

[5] Bailey AJ, Light ND (1989). Connective Tissue in Meat and Meat Products. Elsevier Applied Science, London. (Pyridinoline crosslink formation; heat stability of mature collagen; collagen contraction on cooking; 4 to 6 times higher insoluble collagen in old cattle; chicken skin collagen crosslink profile vs bovine tendon.)

[6] Cross HR, Carpenter ZL, Smith GC (1973). Effects of intramuscular collagen and elastin on bovine muscle tenderness. Journal of Food Science 38: 998-1003. (Collagen as inert structural element; textural inconsistency from intact fragments; collagen cannot emulsify.)

[7] BMLUK. Burenwurst page. Boer War history (1899 to 1902); 20 parts Salzstoß; explicit process statement. https://www.bmluk.gv.at/themen/lebensmittel/trad-lebensmittel/Fleisch/Fleischprodukte/burenwurst.html

[8] Frankel EN (1998). Lipid Oxidation. The Oily Press, Dundee. (Phospholipid oxidation in chicken fat and varket; hexanal/nonenal formation; rancidity risk; antioxidant use. Sheep tail fat fatty acid profile and oxidative stability.)

[9] Purslow PP (2005). Intramuscular connective tissue and its role in meat quality. Meat Science 70: 435-447. (Perimysium as primary mechanical coupler; crosslink maturity and binding loss; exercise hypertrophy in nomadic working muscles.)

[10] Tornberg E (2005). Effects of heat on meat proteins: implications on structure and quality of meat products. Meat Science 70: 493-508. (Myosin extraction; 12 degrees Celsius denaturation threshold; sausage emulsion gel; collagen denaturation 53 to 63 degrees Celsius; bowl cutter temperature control.)

[11] Avery NC, Bailey AJ (2008). Restraining cross-links responsible for the mechanical properties of collagen fibres. In: Fratzl P (ed.) Collagen: Structure and Mechanics. Springer, New York: 81-110. (HP and LP crosslink formation; divalent to trivalent transition with age; heat stability of mature crosslinks.)

[12] Muchenje V, Dzama K, Chimonyo M, Strydom PE, Hugo A, Raats JG (2009). Some biochemical aspects pertaining to beef eating quality and consumer health: a review. Food Chemistry 112: 279-289. (Warm carcass delivery; ante-mortem stress in transported cattle; PSE-like conditions in Zebu supply chains.)

[13] Hamm R and Neraal R (1977). Uber den enzymatischen Abbau von Tripolyphosphat und Diphosphat in zerkleinertem Fleisch. Z. Lebensm. Unters. Forsch. 163: 126-127. (Phosphate hydrolysis in comminuted meat; protein solubilisation.)

[14] Chang HJ, Xu XL, Zhou GH, Li CB, Huang M (2010). Effects of characteristics changes of collagen on meat physicochemical properties of beef semitendinosus muscle during ultrasonic processing. Food and Bioprocess Technology 5: 285-297. (NaCl marination effects on connective tissue collagen; salt-induced swelling.)

[15] Purslow PP (2018). Contribution of collagen and connective tissue to cooked meat toughness. Meat Science 144: 260-268. doi:10.1016/j.meatsci.2018.02.023. (Crosslink density and thermal behaviour; perimysial collagen in cooked toughness.)

[16] Roy BC, Swanson KC, Bruce HL (2021). Intramuscular collagen characteristics. Meat Science 173: 108375. doi:10.1016/j.meatsci.2020.108375.

[17] Whiting RC (1989). Contributions of collagen to the properties of comminuted and restructured meat products. 42nd Reciprocal Meat Conference. (Collagen particles in myosin gel matrix; bite resistance from partial gelatinisation; Burenwurst dual system.)

[18] Feiner G (2006). Meat Products Handbook: Practical Science and Technology. Woodhead Publishing, Cambridge. ISBN 978-1-84569-050-2. (Emulsion stability; myosin extraction; fat emulsification in bowl-cut systems.)

[19] Osterreichisches Lebensmittelbuch (OLMB), IV. Auflage. Codexkapitel B 14, Abschnitt B.2.3.3 Salzstoß; B.4.2.2 Fleischwurste. BMSGPK, current edition. https://www.lebensmittelbuch.at (Primary legal source for Salzstoß definition; Burenwurst Sorte 3b formulation at 20 parts; Waldviertler at 10 parts.)

[20] Contadino.com. Burenwurst page. Das geschmackliche Geheimnis der Burenwurst ist der Salzstoß. https://www.contadino.com/Regionale-Produkte/Burenwurst

[21] BMLUK. Waldviertler page. Workshop sequences; Salzstoß pre-wolfed to 2 to 3 mm. https://www.bmluk.gv.at/themen/lebensmittel/trad-lebensmittel/Fleisch/Fleischprodukte/waldviertler.html

[22] Wikipedia. Fat-tailed sheep. https://en.wikipedia.org/wiki/Fat-tailed_sheep (Distribution; Afrikaner and Namaqua breeds; fat storage physiology; historical use in South Africa.)

[23] ejozi.co.za. Sheeptail Fat in South African Cuisine. http://www.ejozi.co.za/south-african-cuisine/sheeptail-fat.html (Historical use of varket as lamp oil and cooking fat by Khoikhoi and Cape settlers; rendering practice; use in boerewors.)

[24] Lonergan SM, Topel DG, Marple DN (2019). The Science of Animal Growth and Meat Technology, 2nd ed. Academic Press. (Myofibrillar protein extraction; ionic strength and NaCl concentration; Grundbrat formation.)

[25] Willi Wurm. Workshop conditioning method documented from apprenticeship. Personal communication as reported. (Paddle mixer only; no bowl cutter; 6 to 24 hour rest; connective tissue identification.)

[26] Carballo J, Ayo J, Colmenero FJ (1996). Utilisation of soy protein products in meat systems: functional properties versus textured products. Meat Science 43: 237-246. (Distinction between functional soy proteins (SPI) and textured soy products (TVP) on the basis of solubility and interfacial activity. TVP has no surface activity at fat-water interface.)

[27] PMC8950627 (2022). Foods 11(6): 855. doi:10.3390/foods11060855. (NaCl concentration 2.0 to 3.0% equals ionic strength 0.47 to 0.68 M; optimum for myofibrillar protein extraction.)

[28] Nishimura T (2010). The role of intramuscular connective tissue in meat texture. Animal Science Journal 81: 21-27. (Intramuscular CT as scaffold; crosslink density and texture; fine vs coarse texture in old animals.)

[29] Arise AK, Joshi NA, Malomo SA, Duodu KG, Fasiku SA (2017). Nutritional, physicochemical, and functional properties of protein concentrate and isolate of newly-developed Bambara groundnut (Vigna subterranea L.) cultivars. Food Science and Nutrition 6(2): 229-241. PMC5778210. (Bambara protein content 19 to 26% whole seed; protein isolate 81 to 93%; emulsifying activity index and stability; water and oil absorption capacity.)

[30] Mayes S, Massawe FJ, Alderson PG, Roberts JA, Azam-Ali SN, Hermann M (2012). The potential for underutilised crops to improve security of food production. Journal of Experimental Botany 63: 1075-1079. Also: Barimalaa IS et al. (2020). Bambara Groundnut: An Underutilized Leguminous Crop for Global Food Security and Nutrition. Frontiers in Nutrition 7: 601496. PMC7758284. (Bambara protein isolate thermal stability comparable to SPI; BGPI solubility pH-dependent; high-temperature processing reduces emulsifying properties; ANF deactivation by heat under pressure.)

[31] Adegunwa MO et al. (2014). Effects of Treatments on the Antinutritional Factors and Functional Properties of Bambara Groundnut (Voandzeia subterranea) Flour. Journal of Food Processing and Preservation 39: 1875-1883. doi:10.1111/jfpp.12159. (Autoclaving, boiling, soaking effects on ANFs and emulsification capacity; emulsification capacity range 45.88 to 77.57% across treatment conditions.)

[32] Yagoub AA et al. (2017). Effect of Soaking and Boiling on Anti-nutritional Factors, Oligosaccharide Contents and Protein Digestibility of Newly Developed Bambara Groundnut Cultivars. Turkish Journal of Agriculture – Food Science and Technology 5(9): 1006-1013. (Boiling 60 min reduces tannins by 99%; increases in vitro protein digestibility to 87 to 89%; reduces raffinose by 50 to 59% and stachyose by 43 to 59%.)

[33] Nwosu JN et al. (2017). Bambara groundnut (Vigna subterranea (L.) Verdc.) flour: A functional ingredient to favour the use of an unexploited sustainable protein source. PLOS ONE (PMC6188868). (Pre-treatment methods decreased flour emulsification capacity and stability; starch content 47.8 to 52.0%; gelation capacity of BG flours documented for processed meat applications.)

EarthwormExpress | Eben van Tonder and Kristi van Tonder | March 2026