The tang comes from a fermentation process that starts months earlier — bulgur soaked in yogurt, kneaded daily for about a week, then sun-dried into a powder that keeps all year until it's spooned into a pot of hot water.
Dried, fermented kishk powder is whisked into simmering water or broth with garlic and butter until it thickens into a tangy, porridge-like soup, sometimes finished with a fried egg on top. Mountain villages ladle it out on cold winter evenings as a quick, warming meal.