In a large bowl add tomatoes, turmeric powder, tamarind extract, add water and allow it to boil

Once the to tomatoes are cooked mash it well

In a kadai heat 1 tbsp of oil and add mustard seeds, hing, curry leaves add crushed garlic and onions sauté for 2 minutes

Add the grounded rasam powder and fry for a minute (Do Not Burn It) add the tomato mixture, salt and allow it to boil

Once it gets frothy add coriander leaves and switch off the flame

Serve it with hot rice. When you have cold, just drink like a soup