Ingredients:
8-10 pieces hilsa - about 1 kg.
1/2 tsp turmeric paste
1/2 tsp chilli paste
2 tbsp mustard paste
1/4 tbsp. mustard seeds
4 tbsp. mustard oil
Lump of tamarind, the size of a golf ball, or 1 tbsp. tamarind
1 tbsp. tamarind concentrate
3 cups water
Salt to taste
1/2-1 tsp. sugar
4-6 green chillies, slit