Clean the fish pieces and marinate with half Lemon, salt and vinegar for 30 mins

Clean the marinated pieces with water and mix with lemon, salt and mustard oil and keep it aside for 15-20 mins

Put some Cornflour powder on the pieces and fry the pieces till golden brown (egg white also can be used with Cornflour)

Heat some oil in a pan and add Jeera seeds, bay leaves till it crackles

Add the cut onions and garlic and saute till golden brown. Add Ginger paste and saute till the masala is cooked

Prepare the poshto paste- grind poshto into a dry powder and mix cashew paste, curd, Jeera powder, chilli powder, salt into this

Add the above masala into the pan and let it cook for few mins

Once masala is well cooked add some water and bring it to boil. Add the fried fish pieces to it and let it boil for 5 mins