1Heat oil (1 1/2 inches) in heavy saucepan or deep fryer to 350ºF. Lightly coat fish with 3 to 4 tablespoons Bisquick mix.
2Mix remaining ingredients with hand beater until smooth. (If batter is too thick, stir in additional beer, 1 tablespoon at a time, until desired consistency.) Dip fish into batter, letting excess drip into bowl.
3Fry fish about 2 minutes on each side or until golden brown; drain. Serve hot and, if desired, with tartar sauce.