Combine diced fruit and whiskey; mix well. Let stand while preparing batter. Beat egg yolks, beer, and butter together. Add dry ingredients; beat until no lumps remain. Cover; refrigerate 2 hours. Drain fruit well; mix with batter. Whip egg whites until stiff but not dry. Fold into fritter batter lightly but thoroughly. Meanwhile, heat 3 inches of oil in deep fryer to 375 degrees. Drop batter by tablespoons into hot oil; cook until golden (3 to 4 minutes). Drain on absorbent paper. Dust with confectioners sugar. Serve immediately. Makes 6 servings.