Doogh looks like nothing at first glance — a pale, slightly fizzy yogurt drink, usually served in a tall glass with ice and a sprig of dried mint. Order it once alongside a kebab and you'll understand immediately why Iranians have been drinking it for thousands of years.
At its simplest, doogh is yogurt thinned with water and lightly salted, sometimes with a natural sparkle from fermentation, sometimes carbonated. Dried mint is nearly universal, and it's what gives doogh its distinctive, cooling finish. It sounds like an odd pairing with grilled meat until you actually try it: the acidity and salt cut straight through the richness of koobideh or joojeh the way a squeeze of lemon might, but with a coolness that iced water simply can't match.
Doogh's roots go back to ancient Persia, long before refrigeration existed, when a salted, fermented yogurt drink was both a practical way to preserve dairy and a genuinely refreshing answer to hot summers on the Iranian plateau. It's stayed on Persian tables ever since for the same reason most enduring foods survive: it simply works.
It won't be for everyone on the first sip — the tang and the saltiness are unlike most Western drinks — but we'd gently encourage you to try a small glass alongside your kebab rather than skipping straight to the soft drinks menu. It's how the dish is meant to be eaten in Iran, and most first-timers who try it end up ordering it again before the meal is over.