Ingredients: Hilsa fish 6 pieces (the pieces should be cut from the middle portion), Yoghurt 7-10 tbsps, mustard and green chilli paste 2.5 tbsps, mustard oil 4-5 tbsps, 3-4 whole green chillies cut from the middle, salt 3 tbsps.
Method: The Hilsa fish should be absolutely fresh and the pieces must be washed properly so that there is no smell. Put the pieces of fish in a container so that the lid can be put tightly. Put all the ingredients one by one on the fish. Mix properly so that the masala gets inside the opened portion of the fish. Close the box tightly and put it on boiling water. Cover the container where the fish is put on boiling water. Bring it off the heat after 20 minutes. Let it cool a bit and then open the box. Serve it with steaming rice.