Ingredients:
Put the amount that you think you would need depending on the no. of fishes to be cooked.

Onion
Garlic
Ginger
Cinnamon Stick (an inch)
Pepper Corn
Cloves
Cumin Seeds
Turmeric Powder
Salt & Sugar (to taste)
Dried Red Chillies (soak it in water)
Tamarind Paste
Vinegar (to taste)

Directions:

1. Roast the first three ingredients : onion, garlic and ginger.

2. Grind all the above ingredients (except the vinegar) to make a thick paste, then add the vinegar to taste. Grind till it becomes thicker like paste.

3. Cut the sides of the fish and stuff it with the paste. Spread the paste all over the fish and marinate for at least 30 minutes.

4. You can either fry or grill (wrap it in aluminum foil) it.