Boil tomatoes with 1 cup of water for 5 minutes.
Add tamarind juice to this and boil for 2 minutes.
Grind cumin seeds, pepper, garlic and coriander leaves.
Add ground mix and keep it aside.
grind tomato pieces also.
Blend them to get smooth puree.
Next heat oil in a kadai and add mustard seeds When mustard crackles add dry red chilly and curry leaves
Add rasam powder to that and stir for a minute.
Mix with tomato mix and mix all together .Then boil for 2 minutes.
Now rasam is ready.Add some coriander leaves to this
we can serve rasam with hot rice.