Wash the fish twice clean all the guts if any left in the fish squeeze lime juice and little salt on the fish and wash the fish twice again drain all the water pat dry with a kitchen towel and reserve in a plate. if you do not have fresh lime at home then wash fish with vinegar and salt this way of cleaning helps to remove any fish smell.
In a bowl add the chilly powder, turmeric powder, pepper powder, salt and mix with only vinegar do not add water instead of vinegar you can add tamarind water.
Apply the masala paste on the fish cover and marinate for 3 hours for best result allow to marinate for 5 hours in the fridge.
Get the fish to room temp before frying.
Heat a tava or any iron skillet add 4 tbsp of oil and shallow fry the fish till both sides turn golden brown in color.
cook the fish on low flame and flip the fish real gentle to turn sides and roast till well done.
Serve hot as is or with rasam rice to enjoy.