Fry the Fish: Heat the oil in a small frying pan until it begins to shimmer but not smoke. You’ll want about an inch of oil; almost cover the fish. Add more as needed, based on your pan. You can test the oil temperature by putting in a small drop of batter. If it sizzles vigorously, you’re good to go. Fry 3-4 fillets at a time. The oil should rise to about halfway up the filet. Flip over after about a minute or once golden brown. Cook for 1 more minute and then remove to paper towel