Clean the Rui fish pieces and rub them with 1/2 to tsp turmeric powder and salt.Heat mustard oil in a pan until smoking hot fry the fish pieces until they turn golden brown on both sides.Remove and set aside.In the same reming oil add the red chilli add the chopped onion to the pan.Saute until it turns golden brown.Stir in the ginger garlic paste and cook for a couple of minutes until the raw smell disappears add the turmeric powder, kashmiri red chilli powder, cumin powder.Saute the spice

Mix wells add the tomato puree and cook until the oil separating from the masala.Lower the heat and add the whisked plan yoghurt slowly while stirring continuously to prevent it from.Curding cook the mixture for 5 minutes.Add 2 cup of water and salt.Bring the gravy to a rolling boil.Cover the pan and let it simmer for about 5minutes.Gently side the fried Rui fish y into the boiling gravy cover and cook medium heat for about 5minutes so the fish absorbs the flavours.

Sprinkle the garam masala powder,2 green chilli over the curry.Turn off the heat and let it rest covered for 2 minutes before serving.Durga puja special navmir bhog (Rui fish Kalia) is ready.