Broth Ingredients
water leftover from cooked horse gram
½ lime size tamarind, juiced
For the paste
1 tablespoon sesame oil
2 teaspoon black pepper
1 teaspoon cumin seeds
3-4 cloves garlic
1 medium tomato
1 teaspoon salt
¼ cup cooked horsegram
For tempering
½ teaspoon mustard seeds
½ teaspoon urad dal
¼ teaspoon fenugreek seeds
¼ teaspoon cumin
1 sprig curry leaf
Finishing
1 teaspoon jaggery (optional)
1 tablespoon coriander leaves
Boil ¼ cup of horsegram with 2 cups of water in a pressure cooker for 10 minutes. Drain the water and set aside.
Soak half a lime size tamarind in water for 15 minutes and make a puree out of it and set aside. Tamarind water gives the rasam that tang.
Heat sesame oil in a pan and add pepper, cumin and garlic and saute till it starts to pop.
Add in one medium chopped tomato. Add in the salt. Cook the tomatoes till they start to become semi dry. Add in 3-4 tablespoons of cooked horsegram and remove off heat.
Let this mixture cool and then grind to a smooth paste. Heat oil in a pan and add mustard seeds, urad dal, fenugreek seeds and cumin. Let it pop. Add in the tamarind juice, the ground paste and the curry leaves. Let it simmer on low flame for 10 minutes.
Add in the kollu/horsegram leftover lentil water. Cook for a couple of minutes more. Add in a small piece of jaggery and coriander leaves. Remove off heat.
Serve hot with rice. If there is leftover rasam, strain it next day in a mesh strainer and slightly heat it and serve as a nice warm broth.