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- 1 tbsp (15 ml) oil or ghee - 1/2 tsp (2.5 ml) mustard seeds - 1/2 tsp (2.5 ml) cumin seeds - 1/2 tsp (2.5 ml) coarsely crushed black pepper - 1/4 tsp (0.5 g) asafoetida (hing) - 8–10 curry leaves - 2 medium tomatoes, about 10 oz (280 g), chopped - 1 tbsp (15 ml) tamarind paste - 3 cups (720 ml) water - 1/2 cup (100 g) cooked toor dal, lightly mashed - 1 tbsp (15 ml) rasam powder - 1/4 tsp (1.25 ml) turmeric powder - 1/2 tsp (2.5 ml) salt, or to taste - 2 cloves garlic, crushed (optional) - 2 tbsp (8 g) chopped fresh cilantro (coriander leaves)
1. Soak tamarind paste in 1/2 cup (120 ml) warm water for 10 minutes, then squeeze and strain to make tamarind water; set aside. 2. Heat oil or ghee in a saucepan over medium heat. Add mustard seeds and cumin seeds; when they sputter, add crushed pepper, asafoetida, curry leaves and crushed garlic; sauté 30 seconds. 3. Add chopped tomatoes and turmeric; cook until tomatoes soften and begin to break down, about 6–8 minutes. 4. Pour in tamarind water and remaining 2 1/2 cups (600 ml) water, then stir in rasam powder and salt. Bring to a gentle simmer for 8–10 minutes to let flavors meld. 5. Add the lightly mashed cooked toor dal and simmer 2–3 minutes more; adjust consistency with additional hot water if desired and check seasoning. 6. In a small pan, heat 1 tsp (5 ml) ghee, add a pinch of mustard seeds and a few curry leaves for a final tempering; pour over the rasam. Garnish with chopped cilantro and serve hot with rice or as a broth.
Per serving | Servings: 4
Nutrition estimated: November 5, 2026
*Values are estimates based on USDA data and mathematical calculations. Actual values may vary. Where data are unavailable, those contributions are excluded. Calories, Carbohydrates, Protein, Fat and Fiber are known subtotals. Missing contributions are unknown, not zero.