Fry the karamani with a teaspoon of oil. Add two cups of water and pressure cook for two to three whistles.
Soak tamarind and salt in a cup of water.
Fry coconut gratings, khus khus and jeera in a teaspoon of oil till you get nice aroma. Cool it and grind to a fine paste.
Cut the brinjals into medium size pieces. Chop the onion finely.
Squeeze out tamarind juice. Add more water and take out tamarind juice and it should be atleast 3 cups. Add turmeric powder and sambar powder to the juice. Add cut brinjals and cooked cow gram and bring to boil. Allow to boil till the brinjals are soft. Now add the ground coconut paste and mix well. Let it boil in medium flame for five more minutes.
Season it with mustard, chopped onion and curry leaves.