1. Soak the tamarind in water for about an hour and extract the pulp.
2. Dry roast the chilies, coriander seeds, cumin seeds, 4 cloves of garlic with turmeric with 1 table spoon of oil
3. Use little water and grind the above to a fine thick paste with tamarind.
4. Heat oil in a pan. Add the mustard seeds, curry leaves, crushed garlic, when they splutter, add the paste, water as needed, salt and bring it to a boil.
5. Add the shrimps and simmer for 5 to 8 minutes.
6. Serve hot over rice.