First, heat about 150ml of mustard oil in a pan.
While the oil is getting hot, cover your marinated Topse fish completely with the batter.
Carefully place 2-3 fish in the hot oil, depending on the size of your pan.
Fry them for around 3 minutes per batch, keeping the heat at medium. Remember to flip the fish occasionally so they cook evenly.
When they're ready, the batter will be nicely crisp and a light golden brown color.
Remove the fried fish from the oil and let the excess oil drain off using a perforated bowl or kitchen towel.
Repeat the frying process with the rest of your Topse fish.
Don't throw away the leftover batter!
You can use it to make tasty Byason-er Bora, also known as Besan Pakoda. These little fritters are a treat all on their own, and they're perfect with a cup of tea or coffee!