Chennai Style Tamarind and Mustard Seed Rasam Soup

By AislePrompt Test Kitchen · Reviewed by AislePrompt Editorial · ·

A comforting tangy and spicy rasam soup that combines tamarind and mustard seeds, perfect to warm up on a rainy Chennai day. This indian-inspired soups (gluten free, vegan) ready in about 35 minutes pairs tamarind paste, water, medium tomato, chopped for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 70 calories and feeds 3, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 15 min Cook: 20 min Serves 3 Indian cuisine 70 cal/serving
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Ingredients

Instructions

  1. Step 1: Soak 1 tbsp tamarind paste in 1 cup warm water for 10 minutes, then squeeze and strain to extract tamarind water.
  2. Step 2: In a blender, grind 1 tsp cumin seeds, 1/2 tsp black peppercorns, 1 dried red chili, and 2 crushed garlic cloves into a coarse powder.
  3. Step 3: In a pot, combine 3 cups water, tamarind water from step 1, 1 chopped medium tomato, the ground spices from step 2, and 1 tsp salt. Bring to a boil and simmer for 10 minutes.
  4. Step 4: Heat 1 tbsp oil in a small pan over medium heat. Add 1 tsp mustard seeds and wait until they pop, then add a pinch of asafoetida and 6 curry leaves. Fry for 30 seconds until fragrant.
  5. Step 5: Pour the tempered oil mixture into the simmering soup, stir well, and simmer for another 5 minutes.
  6. Step 6: Remove from heat and garnish with 2 tbsp chopped fresh coriander leaves before serving hot.

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Frequently asked questions

How long does Chennai Style Tamarind and Mustard Seed Rasam Soup take to make?

Total time is about 35 minutes (15 min prep + 20 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Chennai Style Tamarind and Mustard Seed Rasam Soup?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep tamarind paste from drying out.

Can I substitute ingredients in Chennai Style Tamarind and Mustard Seed Rasam Soup?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Chennai Style Tamarind and Mustard Seed Rasam Soup for a different number of people?

The recipe is written for 3 servings. Multiply each ingredient by (your serving target / 3). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

Is Chennai Style Tamarind and Mustard Seed Rasam Soup gluten free?

Yes — this recipe is tagged gluten free, vegan based on its ingredient list. Always cross-check labels for packaged ingredients (sauces, broths, condiments) since formulations vary by brand.

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