Kongunadu Kollu Rasam
A clear, spicy horse gram soup known for its weight loss properties.
About this dish
A staple from the western Kongu region of Tamil Nadu, this rasam is a rustic, therapeutic broth made using the water from boiled horse gram. It is celebrated for its ability to cut through phlegm and aid weight loss. Unlike regular tamarind-based rasams, this version uses the earthy richness of the legume as its primary flavor profile.
Ingredients
The Legume Base
- 1/2 cup Horse gram (Kollu)
- 3 cups Water for pressure cooking
- 1/4 tsp Turmeric powder
Fresh Spice Grind
- 1 tsp Black peppercorns
- 1 tsp Cumin seeds
- 4 cloves Garlic, unpeeled
- 2 Dried red chilies
Tamarind and Tempering
- Small lemon-sized ball Tamarind, soaked and extracted (1 cup juice)
- 1 Tomato, crushed by hand
- 1 tsp Mustard seeds
- 1/4 tsp Asafoetida (Hing)
- 2 sprigs Curry leaves
- 1 tbsp Cold-pressed coconut oil or Ghee
Method
- 1
Cook the Horse Gram
Wash the horse gram and pressure cook with 3 cups of water and turmeric for 6-8 whistles until very soft. The gram takes longer than toor dal to cook.
- 2
Extract the Broth
Strain the water from the cooked gram into a bowl. This dark, earthy water (Kollu Thanni) is the base of your rasam. Keep 2 tablespoons of the cooked gram aside.
- 3
Prepare the Kollu Paste
Grind the 2 tablespoons of cooked horse gram into a smooth paste. This acts as a natural thickener and intensifies the flavor.
- 4
Crush the Spices
Using a mortar and pestle, coarsely crush the peppercorns, cumin, garlic, and red chilies. Do not use a blender; the coarse texture is vital for the rustic Kongu style.
- 5
Combine Liquids
In a pot, mix the horse gram broth, tamarind extract, hand-crushed tomato, and the ground Kollu paste. Add salt and a bit more water if it looks too dark.
- 6
The First Froth
Place the pot on medium heat. Add the crushed spice mix. Watch carefully; as soon as you see bubbles forming on the edges and a layer of white froth ('nurai') covers the top, switch off the heat immediately. Never boil rasam.
- 7
The Tempering
Heat coconut oil in a small pan. Add mustard seeds. When they pop, add the asafoetida and curry leaves. Pour this sizzling mix over the rasam.
- 8
Steeping
Immediately cover the pot with a lid for 5 minutes. This traps the volatile oils from the garlic and cumin, infusing them deeply into the broth.
Notes & variations
- Don't throw away the remaining cooked horse gram; toss it with coconut and mustard to make a 'Kollu Sundal'.
- The hand-crushed tomato adds a chunky, rustic texture that sliced tomatoes lack.
- If the horse gram water is very thick, dilute it; the rasam should be a clear, light soup consistency.
- Store in a glass or clay pot to maintain the acidity balance.
Serve with
Hot rice and a side of potato fry or Karunai Kilangu Masiyal.
Cook's note
Dry roasting the horse gram for 2 minutes before pressure cooking enhances its nutty aroma significantly.