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Ingredients
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For the Rasam Paste
Soup Base & Vegetables
Seasoning & Finish
Tadka (Tempering)
Method
For the Rasam Paste
Dry roast and grind
Heat a small skillet over medium heat. Add chana dal and toor dal and dry-roast until golden and aromatic, about 2–3 minutes. Add black peppercorns, cumin seeds, coriander seeds and dried red chilies; roast for another 1 minute until fragrant. Remove from heat, cool slightly, then grind with a pinch of asafoetida to a fine powder using a spice grinder or mortar and pestle. Set aside.
Soup Base & Vegetables
If using soaked tamarind pulp, squeeze 2–3 tablespoons of soaked tamarind through a sieve into a cup of water to extract about 1 tablespoon of concentrate (or use 1 tablespoon tamarind concentrate).
Once vegetables are nearly done, add turmeric powder and the ground rasam spice powder prepared earlier. Stir to dissolve the powder and allow the flavors to meld for 2 minutes.
Add the tamarind concentrate and cooked/toor dal (if using) to the pot. If using pre-cooked dal, mash lightly to incorporate. Simmer gently for 4–5 minutes so tamarind flavor integrates. Taste and add salt and jaggery (if using) to balance sourness. If the rasam is too thick, add up to 1 cup water to reach soup-like consistency.
Tadka (Tempering)
Add the broken dried red chili, curry leaves and a pinch of asafoetida. Fry briefly until curry leaves are crisp and fragrant, about 10–15 seconds. Immediately pour this hot tempering over the simmering rasam. Cover the pot right away to trap the aroma.
Finish & Serve
Stir the tadka into the rasam and simmer 1 more minute. Check seasoning and adjust salt, tamarind or jaggery to taste. Turn off heat and sprinkle chopped fresh coriander.
Serve hot as a light soup or with steamed rice. Rasam can be stored refrigerated for up to 3 days; reheat gently and add a little water if thickened.