Chaas
What it is
Chaas is spiced buttermilk: a thin, savory, lightly sour yogurt drink, far more diluted than lassi and seasoned rather than sweetened. It is the workaday digestive cooler of much of India, drunk after meals to settle the stomach.
How it's made
Traditionally chaas is the thin liquid left after churning butter (makkhan) from cultured curd; in modern practice it is more often dahi thinned generously with water and whisked smooth. It is then seasoned — roasted cumin, black salt, fresh ginger, green chili, chopped coriander, and curry leaves are common — and served cold.
Flavor profile
Light, tangy, savory, and refreshing, with the warmth of cumin and ginger and a saline edge from black salt. Thin and drinkable, never rich; the opposite of a thick sweet lassi.
Culinary uses
A digestive drink served at or after the meal, valued in hot weather and after rich or heavy food. In South India the related neer mor (watery spiced buttermilk with curry leaves, ginger, and asafoetida) plays the same cooling role. The same spiced buttermilk also forms the liquid base of kadhi and of buttermilk-based curries.
Regional variations
North Indian chaas is cumin-and-ginger forward; Gujarati versions are common with meals; South Indian neer mor / majjige leans on curry leaves, asafoetida, and sometimes a tempering of mustard seeds. Saltiness and spicing vary by household and region.
Cultural & historical context
As the byproduct of home butter-making, buttermilk was the thrifty, cooling drink of rural India long before it was a café menu item, and Ayurveda specifically prizes takra (spiced buttermilk) as a digestive. Why substitution fails: Western cultured buttermilk is thicker and differently soured, made by culturing milk rather than by churning; thinned plain yogurt seasoned with cumin and black salt comes far closer to authentic chaas than a carton of American buttermilk.
Reference notes
Tags: `buttermilk`, `spiced`, `digestive`, `cooling`, `savory`. Related ingredients: dahi, lassi, ayran, kadhi. Related cuisines: North Indian, Gujarati, South Indian. Suggested links: Dahi, Lassi, Kadhi, Neer Mor, Black Salt.