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Hearty Horse Gram Soup (Kollu Rasam)
A deeply savory, tangy soup from the South Indian countryside, made by slow-simmering nutrient-dense horse gram until it turns creamy. Tempered with garlic, pepper, and curry leaves, this rustic rasam-style soup delivers a gentle heat and smoky aroma that makes it a comforting meal on cool evenings.
For 4 servings
- prep
Soak the horse gram.
Rinse the horse gram thoroughly. Soak in enough water to cover by 2 inches for at least 4 hours or overnight. Drain before using.
TIPLonger soaking reduces cooking time and makes the lentils easier to digest. - pressure cook · ~20 min
Pressure cook the horse gram mixture.
1.In a pressure cooker, add the soaked horse gram, chopped tomatoes, turmeric powder, red chili powder, tamarind paste, and 4 cups of water.2.Close the lid and cook on medium-high heat until the first whistle.3.Lower the heat and continue cooking for 5 more whistles, about 15-20 minutes total.4.Turn off the heat and allow the pressure to release naturally.TIPThe horse gram should be completely soft and mashable. If not, pressure cook for 2-3 more whistles. - prep · ~3 min
Mash and strain the soup base.
Once the pressure drops, open the cooker. Using a ladle or potato masher, mash the cooked horse gram and tomatoes well against the sides. Strain the mixture through a fine-mesh sieve into a clean saucepan, pressing with the ladle to extract maximum liquid. Discard the coarse husks.
TIPMashing while still warm releases more body into the soup. Don't skip straining — it gives the rasam its characteristic smooth, thin consistency. - prep · ~1 min
Crush the pepper and cumin.
Using a mortar and pestle, coarsely crush the black peppercorns and cumin seeds together. You want a chunky texture, not a fine powder.
TIPCrushing just before tempering releases volatile oils that give the soup its signature peppery aroma. - mix · ~5 min
Season and simmer the strained soup.
Place the saucepan with the strained liquid on medium heat. Stir in salt and half of the crushed pepper-cumin mixture. Bring to a gentle boil, then lower the heat and simmer for 5 minutes until slightly reduced and fragrant.
- temper · ~2 min
Make the tempering.
1.Heat ghee in a small pan over medium heat until it shimmers.2.Add mustard seeds and let them pop completely.3.Add dried red chilies, crushed garlic cloves, curry leaves, asafoetida, and the remaining crushed pepper-cumin mix.4.Sauté for 30 seconds until the garlic turns golden and fragrant.TIPDropping the garlic into hot ghee immediately releases its aroma into the fat, which carries it through the entire soup. - mix · ~1 min
Pour the tempering over the soup.
Carefully pour the sizzling tempering into the simmering soup. Stand back — it will splutter dramatically. Stir once to fold the aromatic ghee through the liquid.
TIPThat dramatic sizzle when the tempering hits the soup is what blooms the garlic and pepper flavors throughout. - simmer · ~1 min
Simmer for one final minute.
Let the soup bubble gently for just 60 seconds. This marries the fresh tempering with the earthy horse gram base. Turn off the heat.
TIPOvercooking after tempering makes the spices turn bitter. A quick simmer is all you need. - garnish
Garnish and serve steaming hot.
Ladle into katoris or bowls. Sprinkle generously with fresh chopped coriander leaves. Serve immediately as a warming soup, or pour over steamed rice for a traditional comforting meal.
What to keep in mind.
6 tips from the recipe — small details that make a real difference to the final dish.
- 1Soaking horse gram overnight reduces cooking time and improves digestibility.
- 2Don't skip straining the mash: it removes fibrous husks for a silky-smooth soup.
- 3Crush cumin and peppercorns coarsely; fine powder loses the rustic texture.
- 4Add the tempering just before serving to keep the garlic and curry leaves vibrant.
- 5Use a heavy-bottomed pan for the final simmer to prevent scorching.
- 6For a thinner soup, add an extra ½ cup of water before the final simmer.
Adapt it for your goals.
Vegan
Replace ghee with coconut oil or any neutral oil. Use a vegan-friendly asafoetida. The soup remains equally comforting and tangy.
Low SodiumLow-Sodium
Use no-salt-added tamarind paste and reduce added salt to ¼ tsp. Boost flavor with extra freshly crushed black pepper and a squeeze of lemon juice.
SpicySpicy
Double the dried red chilies and add ½ tsp of freshly ground black pepper along with the tempering for a fiery kick.
High ProteinHigh-Protein
Stir in ¼ cup of cooked moong dal or crumbled paneer after straining for extra protein without altering the soup's character.
Grain FreeGrain-Free
Serve the soup as-is, over cooked quinoa or cauliflower rice instead of regular rice, for a low-carb meal.
Why this is on our healthy list.
Rich in Plant Protein
Horse gram is a legume packed with protein, making this soup a valuable protein source for vegetarian and vegan diets.
High in Dietary Fiber
The slow-cooked horse gram retains its fiber, which supports healthy digestion and promotes satiety.
Good Source of Iron
Horse gram contains iron, which helps maintain healthy blood cells and energy levels, especially important in plant-based eating.
Antioxidant-Rich Spices
Turmeric, black pepper, cumin, and curry leaves provide antioxidants that combat oxidative stress in the body.
Frequently asked questions
Yes, but it will take longer. Simmer the soaked horse gram with tomatoes and tamarind in a covered pot for 45–60 minutes until soft, then mash and strain.
