hilsha fish – 6-8 large pieces
mustard oil – 7-8 tsp
turmeric – 1& 1/2 tsp
green chilies- (whole 4-5)
Salt to taste
kalonji seeds – 1 tsp
yoghurt – 3-4 tsp
mustard seed paste – 4-5 tsp
poppy seed paste – 3-4 tsp
cashew nut paste- 4-5 tsp
grated coconut – 4-5 tsp
green chili paste – 1-2 tsp

Marinate the fish in salt and a little turmeric powder and leave for an hour.
Heat 5-6 tsp oil in a wok. Add the fish pieces into the oil and fry lightly, and keep aside. (If the fish is very fresh, you can even omit this stage)
Marinate the fried fish with a bit of mustard paste, grated coconut and cashew nut pastes and set aside for the flavours to infuse into the fried fish.
Reheat the oil, and add 2 whole green chilli and kalonji. Add the remaining turmeric powder, green chilli paste and yoghurt and cook for few minutes.
Add the remaining mustard paste & poppy seed paste along with a little water. Add salt to taste.
Cover and cook for another 4-5 minutes. Add the fish and simmer for 10 minutes. Check the thickness of gravy.
Then add 2 tsp mustard oil and whole green chillis. Cook for 2- 3 minutes.
Serve hot with plain rice.