Idli Sambar (Steamed Rice Cakes with Lentil Stew)

The idli batter is made by soaking and grinding rice and urad dal separately, then mixing and leaving the combination to ferment overnight; this fermentation is what produces the airy, spongy texture when the batter is poured into molds and steamed for ten to twelve minutes. The resulting discs absorb sauces readily and have a mild, slightly tangy flavor from the fermentation. The sambar starts with toor dal simmered until completely soft and partially mashed to give the broth body, then combined with sauteed onion and tomato along with sambar powder and tamarind water for a ten-minute simmer. Tamarind's pronounced sourness balances the earthiness of the lentils and keeps the broth from tasting heavy, while the spice blend in sambar powder adds a warm background heat without becoming harsh. The final and essential step is tempering: mustard seeds are dropped into very hot oil until they pop and scatter, then the spiced oil is stirred into the finished stew, releasing a nutty, aromatic burst that threads through the whole pot. Dipping or soaking the mild, fluffy idli in the bold, tangy sambar creates the contrast that defines this combination and distinguishes it from eating either component alone. Coconut chutney served alongside adds a cool, creamy counterpoint.