Fat is one of the most misunderstood elements in the craft of biltong and droëwors — yet it is one of the most decisive. The right fat delivers richness, aroma, and a clean mouthfeel. The wrong fat collapses, oxidises, or spoils an entire batch. Generations of makers in the Klein Karoo learned these lessons through experience, long before the chemistry was understood. Today, we know that fat behaviour is not a side detail; it is one of the core pillars of safe, consistent, heritage‑aligned meat drying.

This page introduces the fundamentals. The full science — including fat chemistry, oxidation pathways, ratios, and species‑specific rules — is covered in detail in the book.

Not all fats behave the same during drying. Some support the craft; others destroy it.

Stable fats (such as beef fat and lamb tail fat)

• stay firm during drying

• resist oxidation

• dry cleanly and remain white or cream‑coloured

Unstable fats (including all game fat, pork fat, chicken fat, and soft yellow fat)

• oxidise quickly

• become oily, sticky, or sour

• can spoil an entire batch

This is why traditional makers removed all game fat and relied only on stable fats for droëwors. The difference is chemical, not stylistic — and it determines whether a batch succeeds or fails.

Game fat behaves very differently from beef fat. It is naturally soft, oily, and highly unsaturated, which makes it chemically unstable. When exposed to air, warmth, or light, it oxidises rapidly and produces rancid aromas.

For this reason, species such as kudu, eland, springbok, gemsbok, and wildebeest must always be trimmed clean. The meat dries beautifully; the fat does not. When making droëwors with game meat, the fat must be replaced with a stable alternative such as beef fat or lamb tail fat.

Fat and meat do not dry the same way.

• Meat loses moisture, firms, and shrinks.

• Fat retains its size, softens before it stabilises, and does not lose water in the same way.

This means fat must be trimmed correctly and must be stable enough to withstand the drying process. Thick or unstable fat can trap moisture, collapse, or spoil. Droëwors is even more sensitive because minced fat exposes more surface area to oxygen.

Droëwors depends on the right fat ratio and the right type of fat. Too little fat produces a dry, crumbly sausage; too much fat produces a greasy, unstable one. Cloves play a critical role because they contain eugenol — a natural antioxidant that slows fat oxidation during drying.

When the fat is correct, droëwors dries into a firm, aromatic sausage with clean white flecks. When the fat is wrong, it becomes hollow, oily, sour, or rancid.

(The book explains the exact ratios, the chemistry behind eugenol, and how fat stability determines shelf life.)

Each species demands the correct fat approach:

• Beef biltong uses beef fat trimmed to the proper thickness.

• Kudu biltong uses no fat at all.

• Beef droëwors uses stable beef fat.

• Kudu droëwors uses beef or lamb tail fat — never kudu fat.

• Springbok, eland, gemsbok, and other game species follow the same rule: remove all game fat and replace it with stable fat for droëwors.

These rules are not modern inventions. They are the result of centuries of observation and experience.

Rancidity cannot be reversed — it can only be prevented.

Key principles include:

• using only stable fats

• keeping fat cold during trimming and mincing

• avoiding overworking the mince

• using cloves in droëwors

• maintaining proper airflow

• avoiding high temperatures

• storing finished products in breathable containers

The book expands on the visual signs of rancidity and the chemistry behind oxidation.

Fat is not an afterthought. It is a structural, chemical, and sensory pillar of biltong and droëwors. When you understand fat behaviour, you understand why some batches last for weeks while others spoil in days.

This page offers only a glimpse.

The full science — including fat crystallisation, oxidation pathways, species‑specific behaviour, ratios, and troubleshooting — is explored in depth in the book.