Here is what you will need for preparing it :
King Fish/Surmai : 1 pound- roughly 4 pieces
Lemon Juice: 2 tbsp
Salt: 1 tsp
ginger paste: 1 tbsp
garlic paste: 1 tbsp
mango powder: 1 tsp
Turmeric: 1/4 tsp
Oil: 4 -6 tbsp for shallow frying
Spices to be roasted & ground to fine powder:
Coriander: 1 tsp
Cumin: 1 tsp
Dry kashmiri Chilli: 3
Black pepper corn: 10-12
take the fish,wash it thoroughly and pull out any coagulated blood from the cavities( this can make the fish taste bitter)
Rub a tsp of salt along with a tbsp of lemon juice. Keep it aside for 30 minutes & then wash it and pat dry on a paper towel.
Take the roasted spices powder along with ginger , garlic ,mango powder & turmeric & some salt and rub it all over the fish. Let the fish marinate in this for at least 1 hour preferably in the refrigerator.
Take a heavy bottomed skillet and use 3 tbsp of oil,if you are going to fry the fish in 2 batches. If you have a big pan and it can fit all the fish you will fry than you can add 6 tbsp of oil in one go. Let the oil heat well. take the fish and let it shallow fry on 1 side till done on medium to low flame,you can initially cover the skillet,to avoid the oil from spluttering all over. Now flip the fish and let it fry on the other side. Let the fish fry for the last 5 minutes without any cover to give it a crispy texture.
Squeeze some lime juice before serving along with some sliced onions. You can serve this with some daal & roti's or enjoy the fish with green chutney & some wine that goes well with Indian spices.
Note: Fry the fish for the first couple minutes on high flame covered ,then turn the flame to medium or slow.