Ash-e Doogh

A local staple of Ardabil, Sarein and East Azerbaijan in northwest Iran, where the dish is built on doogh, the salted yogurt drink that anchors the region's cold-weather table. The name reads literally as 'ash made of doogh.' It belongs to the broad ash family — the thick herb-and-grain soups documented in Persian cooking since medieval times — and is the close Iranian cousin of the Caucasus dish dovga, which is typically cooked without meat; the Ardabil version leans heavier, with chickpeas, rice and small meatballs. It is eaten year-round but prized in the cold months and through Ramadan.

Warm, thick and unmistakably sour — the doogh gives a clean dairy tang that sits just short of sharp, softened by the starch of rice and chickpea cooked nearly to a purée. Threads of dill, coriander, tarragon and mint run all through it, the herbs simmered long enough to turn savory rather than raw. Little lamb meatballs give something to chew between spoonfuls, and a slick of fried mint floats on top, its toasted edge cutting the richness.

The technical hurdle is keeping the yogurt from curdling: stirred over heat, plain yogurt breaks and the soup turns grainy. Cooks beat in an egg and a spoon of flour or rice starch first, which coat the casein and hold the emulsion smooth as it warms; the doogh is then added near the end and the pot kept below a hard boil, stirred steadily for the last stretch. The herbs go in early so their raw green note cooks off, and the rice and chickpeas are simmered down until they thicken the broth from within rather than sitting in it.