Beat egg yolks until thick and lemon-colored, Combine with flour. Add beer and milk. Beat until smooth. Add salt , sugar and butter. Mix well. Beat egg whites stiff. Fold in egg white. Pour a little of batter in 6 inch greased skillet. Rotate skillet to spread batter over surface. Brown on both sides. Repeat until all batter is used. Serve hot with strawberry preserves. \About 18 pancakes.