Garlic

Garlic appears in more cured meat recipes than any flavouring except salt and pepper. It runs through the Polish kiełbasy, the Spanish chorizos and morcillas, the Italian salami of the south, the Balkan and Levantine sausages, and almost every fresh sausage made anywhere. Where a tradition uses it, it is usually not a background note but part of the identity: a Toulouse sausage without garlic is not a Toulouse sausage.

The flavour chemistry is worth understanding because it explains why the same weight of garlic can taste quite different. Intact garlic is almost odourless. The smell appears only when the clove is cut or crushed, which brings the enzyme alliinase into contact with alliin and produces allicin within seconds. Allicin is unstable and breaks down in turn into the sulphur compounds that carry the familiar aroma. Heat destroys alliinase, so garlic that is cooked whole before it is chopped stays mild and sweet, while raw crushed garlic is at its most pungent. In a raw fermented sausage the garlic is at full strength and it will also mellow over a long maturation, so a salami tasted green is not the salami you will eat.

Form is the practical decision. Fresh garlic is roughly two thirds water, so a recipe that calls for 3 g of fresh garlic per kilo is adding water as well as flavour, which matters in a dry sausage where every gram of added moisture has to leave again. Dried granulated garlic carries perhaps three times the flavour of the same weight of fresh, and garlic powder more still, so a substitution made by weight rather than by strength is a common way to ruin a batch. The house habit is to state which form the recipe means and to weigh it, never to count cloves: a clove ranges from about 2 g to over 7 g depending on the variety and the season.

Garlic is mildly antimicrobial, and this is often overstated. Allicin has real activity against a broad range of bacteria in a laboratory dish. In a sausage, at the fractions of a per cent used for flavour, and against the salt, nitrite, acidity and drying that are doing the actual work, its contribution is not a hurdle you can count. Treat it as a flavouring that happens to be slightly hostile to spoilage organisms, not as a preservative.

It has one genuine effect on fermentation. Garlic supplies fermentable carbohydrate, mostly fructans, and a heavy dose can feed the culture and drop the pH faster than the recipe intends. In a sausage seasoned at a per cent or more of fresh garlic this is worth allowing for when setting the sugar. Fresh garlic also carries its own surface population of bacteria and moulds from the soil, which is one more reason to keep it cold and to use it promptly.

Across the traditions the quantity varies enormously and tells you what the sausage is for. A Milanese salami may carry a whisper, rubbed into the casing rather than mixed through. A Spanish chorizo carries a few grams per kilo. A Polish biała or a Balkan sudžuka can run to ten grams or more. When a recipe seems extreme in either direction, it is usually the tradition speaking rather than an error.