Chocolate raspberry waffles

1 3/4 cups cake flour
6 tablespoons sugar
1 tablespoon baking powder
1/2 teaspoon salt
2 eggs, separated
1 cup milk
2 (1 ounce) squares unsweetened baking chocolate
3 tablespoons shortening

In a mixing bowl, combine flour, sugar, baking powder and salt. Combine egg yolks and milk; stir into dry ingredients. In a double boiler or microwave, melt the chocolate and shortening. Add to batter; mix well. In another mixing bowl, beat egg whites until stiff peaks form; fold into the batter. Bake in a preheated waffle iron according to manufacturer's directions until browned.