Cut the fish in portions, wash, dry and sprinkle with salt and a pinch of turmeric. Set the fish aside.

Slice the onions and saute in oil.

Add the crushed garlic and grated ginger.

Season with salt, turmeric, and pepper to taste. Mix thoroughly.

Lower the flame and add the fresh tomatoes. Simmer until the tomatoes are reduced to a fairly thick sauce.

Add cumin powder, coriander powder, crushed mustards seeds, cloves, cardamom pods, chilly powder to taste and vinegar. Mix thoroughly and simmer for five minutes.

When the sauce is prepared, add the portions of fish.

Cover and simmer until the fish is cooked through and tender. Care should be taken not to overcook so that the fish does not break up.

:- Serve hot on a bed of rice.