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Idli Sambar is a beloved staple of Tamil Nadu and the broader South Indian peninsula, where soft steamed rice cakes meet a tangy, spiced lentil stew fragrant with tamarind and curry leaves. This combination has been served in homes and tiffin centers from Chennai to Bengaluru for centuries, forming the backbone of the South Indian breakfast tradition.
Jump to recipePrepare the idli batter the night before: Rinse the idli rice thoroughly and soak it in 4 cups of water for 6 to 8 hours. Separately, rinse the urad dal and fenugreek seeds together and soak them in 2 cups of water for the same duration.
Drain the soaked urad dal and fenugreek seeds, then grind them in a wet grinder or high-powered blender with 1/2 cup cold water, adding water one tablespoon at a time as needed, until the batter is smooth, white, and fluffy — about 10 to 12 minutes in a blender. Transfer to a large bowl.
Drain the soaked rice and grind it coarsely with 1/2 cup cold water until a slightly grainy but smooth batter forms, about 8 minutes. Combine with the urad dal batter, add 1 tsp salt, and mix well with a clean hand (body heat aids fermentation). Cover loosely and ferment at room temperature for 8 to 12 hours or overnight, until the batter has risen and turned slightly sour.
Prepare the sambar: Rinse the toor dal and pressure cook it with 2.5 cups of water, the chopped tomato, quartered onion, and turmeric powder for 4 whistles (about 15 minutes on medium heat). Allow the pressure to release naturally, then open and whisk the dal until smooth.
Extract tamarind water by squeezing the soaked tamarind pulp thoroughly through your fingers into its soaking water, then strain out any seeds and fiber, yielding about 3/4 cup tamarind extract.
Add the tamarind extract, drumstick pieces, diced carrot, pearl onions, sambar powder, and 1 tsp salt to the cooked dal. Bring to a boil over medium heat, then reduce to a simmer and cook for 15 to 20 minutes, until the vegetables are tender and the raw tamarind smell has cooked off. Stir in the jaggery.
Prepare the tempering for sambar: Heat 2 tbsp vegetable oil in a small pan over medium-high heat. Add mustard seeds and let them splutter for 30 seconds, then add cumin seeds, dried red chilies, and curry leaves. Sizzle for 20 seconds, then add the asafoetida. Pour the entire tempering into the simmering sambar immediately. Stir, taste for salt, and garnish with fresh cilantro. Keep warm.
Steam the idlis: Lightly grease idli molds with a few drops of oil. Stir the fermented batter gently without deflating it. Fill each mold about 3/4 full. Pour 2 cups of water into a large steamer or idli pot and bring to a vigorous boil. Place the filled idli stand inside, cover tightly, and steam over medium-high heat for exactly 10 to 12 minutes.
Check doneness by inserting a toothpick or wet finger into an idli center — it should come out clean and the idli should feel set but springy. Remove the stand, let rest for 2 minutes, then use a wet spoon to scoop the idlis cleanly out of the molds.
Serve immediately: arrange 3 to 4 idlis per person in a deep plate and ladle generous amounts of hot sambar over and alongside them. Accompany with coconut chutney if desired.
⏱ 35 minutes