In Afghan cooking, yogurt is more than an ingredient. It’s mast, and mast appears at almost every meal in some form. The role of yogurt in Afghan food culture is broader and deeper than the supermarket tubs available in Australian shops would suggest, and several specific Afghan yogurt preparations don’t have direct equivalents anywhere else in Central Asian cooking.

I grew up watching my mother and grandmother prepare yogurt fresh in our home in Kabul. The making of mast was a regular kitchen activity, not something you bought in containers. That practice continued when our family came to Sydney, though the daily mast-making has become less common as cousins and aunties have increasingly relied on commercial yogurt for everyday use. The traditions are still being maintained for special occasions and for specific recipes where store-bought just won’t do.

What mast is, properly

Mast in the Afghan tradition is whole-milk yogurt, often unstrained, with a flavour and texture that’s distinct from European yogurts. The fermentation produces a yogurt that’s tangy but not sharp, creamy but not heavy, with a balance that supports both savoury and sweet uses across the same day’s cooking.

The traditional preparation uses raw or unprocessed milk where it’s available, with a starter culture from a previous batch — what my grandmother called the “mother”. The starter culture matters substantially. The same milk fermented with different starters produces meaningfully different yogurts. The bacterial cultures that have been kept alive across generations in Afghan kitchens have their own character that commercial yogurt cultures don’t quite replicate.

In Australia, the access to genuine raw milk is restricted by food safety regulations, and most Afghan families here use pasteurised whole milk for everyday yogurt-making. The result is good but discernibly different from the milk-and-culture combination available in Afghanistan. The traditional Afghan dairy culture had access to milk varieties — particularly buffalo milk in some regions — that aren’t generally available here. The yogurts produced from buffalo milk had a distinctive richness and texture that’s particularly missed in the diaspora.

Daily mast

The everyday Afghan use of mast is as a fresh dairy alongside meals. A small dish of plain mast accompanies most lunches and dinners, eaten alongside the rice, the meat, the vegetables. The function is partly cooling — the yogurt balances the spiced cooked dishes — and partly digestive, as the live culture supports the digestion of the substantial meals that traditional Afghan cooking provides.

The everyday mast is plain. No salt, no flavouring, no additions. The yogurt itself is the contribution. Other dishes provide the seasoning and the complexity; the mast provides the contrast and the freshness.

In Australian Afghan households, this practice persists for traditional meals but has lost ground for everyday eating. Children growing up here often expect yogurt to be flavoured or sweetened in the European pattern, and the plain mast tradition has competed with commercial yogurt formats in the family fridge.

Mast as a cooking ingredient

Beyond the daily side dish, mast is a foundational cooking ingredient.

Quroot — dried yogurt — is one of the distinctively Afghan preparations. Strained yogurt is salted, dried, and formed into small balls or discs that can be reconstituted later by soaking in water. The reconstituted quroot has a different flavour from fresh yogurt — more tangy, more concentrated, with an earthy character from the drying process. Quroot is fundamental to certain Afghan dishes, particularly the sauces for ashak (the herb-filled dumplings) and mantu (the meat-filled dumplings) where the quroot-based sauce defines the dish.

Quroot is hard to make properly in Australian conditions because the drying step requires consistent low-humidity warm conditions over several days, which Australian weather doesn’t reliably provide. Most Afghan-Australian families now buy quroot from imported sources or rely on substitutes (yogurt-cream-cheese mixes, for example) that approximate but don’t replicate the distinctive flavour. The dishes that depend on quroot are partially diminished in the diaspora as a result.

Yogurt-based sauces for kabobs and grilled meats. The marinades for chapli kebab, for tikka kabobs, for various lamb preparations all incorporate mast as both a flavour-balancer and a tenderiser. The acidity of the yogurt breaks down meat fibres while the milk solids carry the spices into the meat. Thirty minutes of yogurt marinade transforms tough cuts into something tender and well-flavoured.

Yogurt soup. Mast-based soups, sometimes thickened with rice or barley, sometimes flavoured with mint and garlic, are a traditional dish that varies by region within Afghanistan. The Helmand region and the eastern regions both have characteristic yogurt soup preparations that use the mast as the soup base rather than as an addition.

The Australian context

The transition from Afghan kitchen practices to Australian conditions has produced predictable adaptations and some genuine losses.

The fresh mast tradition continues in homes that prioritise it. The equipment is simple — a heavy pot, a thermometer, a container to hold the fermenting yogurt — and the method is teachable across generations. Older Afghan-Australians often maintain the practice; younger ones increasingly rely on store-bought.

The store-bought yogurts that come closest to Afghan mast in flavour and texture are the Greek-style whole milk varieties, particularly the unstrained ones. Greek yogurt is not Afghan mast — the cultures are different, the milk treatment is different — but for everyday cooking purposes the substitution works.

The specialty Afghan grocery stores in Sydney, Melbourne and other Australian cities now carry imported and locally-made versions of various Afghan dairy products. The quality varies; the better stores produce yogurt and quroot that’s reasonably faithful to traditional preparations. The community knowledge of which stores produce good versions of which products is genuine community knowledge, shared informally among Afghan-Australian families and at community events.

For families who want to make their own mast in Australia, the basic technique is straightforward. Heat whole milk to roughly 80°C, hold briefly, cool to roughly 45°C, stir in a small amount of plain commercial yogurt as starter, place in a warm spot for 8-10 hours, then refrigerate. The result is a basic mast that’s good for everyday use. Achieving the specific character of family yogurt traditions takes more practice and ideally exposure to the family’s traditional preparation.

What I’d tell a non-Afghan cook trying Afghan recipes

Three practical things.

Don’t substitute Greek yogurt for mast and assume the result will be the same. The substitution works for many dishes but the flavour difference is real and meaningful for traditional dishes. If you can find proper Afghan or Iranian yogurt at a Middle Eastern grocery, use it.

For dishes that call for quroot, do not substitute fresh yogurt. The dried, concentrated flavour is the point. Reconstituted quroot or dried yogurt powder from a Middle Eastern grocery produces results that fresh yogurt can’t.

The role of yogurt in Afghan meals is structural. It’s not a topping or a dip; it’s the cool counterpart to the cooked dishes. Serving Afghan food without proper plain mast on the side misses part of how the meal is meant to be experienced.

Mast carries meaning in Afghan cooking that can’t be entirely conveyed through ingredients and technique. The traditions of yogurt-making, of using yogurt across the meal, of preparing the family-specific dishes that depend on yogurt, all carry cultural and family memory that goes beyond the food itself. Maintaining those traditions in the diaspora is part of how Afghan food culture stays alive across generations and continents. Each pot of mast made in a Sydney kitchen carries a small piece of that continuity.