Ingredients

1 (12 fluid ounce) can frozen lemonade concentrate

1 (12 fluid ounce) can frozen limeade concentrate

1 cup confectioners’ sugar

4 egg whites

6 cups crushed ice

1 liter carbonated water

1 lime, sliced

coarse salt

Preparation

In a 4 quart container, combine lemon and limeade concentrate, powdered sugar, egg whites, and crushed ice; mix well. Cover and freeze at least 30 minutes before serving. Spoon 2 cups of the mixture into blender. Add 1 cup of carbonated water and blend until frothy. To serve, rub rim of glass with lime slice, dip in salt, and fill glass. Garnish with lime slices. (Downside - someone has to man the blender one in awhile)