Heat the oil in a large pot or deep fryer to a temperature of 375 F.

In a large bowl whisk the beer, egg, baking soda and salt and pepper. Whisk until well-combined. Start adding the flour and whisk until it starts to thicken and sticks to the whisk. You will probably use about ½ cup of flour, but add it slowly, so you get the right consistency.

Coat the filets with flour before dipping them into the batter. Then dip the fish, piece by piece into the batter and let the excess drip off and ensure the fish is fully coated.

Once you have coated a piece of fish, put it into the oil before moving onto the next piece, but work quickly to ensure even cooking of all the pieces. Using a fork, gently dip the fish into the oil and hold there for a few seconds before letting go. This will keep the fish from sticking to the bottom of the pot. Then repeat the process with the rest of the filets.

Cook the fish for about 5-6 minutes until nicely browned and it reaches an internal temperature of 140 F. Place the fish on some paper towel to remove excess oil.