Clean the crabs. If the crab is big, cut them into 2 pieces to make eating easier. Slightly crush the legs with pestle(beat it just once or twice just to crack the outer shell slightly).

Heat 1 tea spn of oil and fry coriander seeds. Grind them with red chllies, coconut and tamarind to a smooth paste.

Heat remaining oil and fry onions till they are slightly brownish. Add ground masala, salt and cook for 2-3 min. Now add the crabs and cook for around 12-15min.

Serve hot with rice.

The taste of gravy increases once the crabs absorbs the gravy. So preferably serve it after 3-4 hours.