Heat oil (1 1/2 inches) in heavy 3 quart saucepan or deep fryer to 350 F coat fish with 3 to 4 tablespoons Bisquick mix.
Beat 1 cup Bisquick mix, the beer, salt and egg with hand beater, until smooth. (if batter is too thick , stir in additional beer, 1 tablesppoon at a time, until desired consistency) Dip fish into batter, letting excess drip into bowl.
Fry fish in oil about 2 minutes on each side or until golden brown, drain. Serve hot with tartar sauce.
These fillets are awesome sandwiched in burger buns. Add tangy tartar sauce, crispy lettuce leaves and a tomato slice for the Ultimate Fish Sandwich