Smear the fish with a paste of salt, turmeric and pepper and fry till cooked.

Cook the tomato in a cup of water and take the puree through a sieve.

Grind the skin of the chillies, ginger and garlic.

In a flat vessel or frying pan, fry a half cup of onions.

Add the masala, fry well and then saute the onion pieces with it.

Pour the vinegar, puree, salt, soyabean sauce and 1 cup of water.

When it boils well, put the fish.

Season with sugar and allow the gravy to thicken.

Garnish with onions cut into roundels.

:- Serve hot.