Margarita Punch for Children

12 ounce can frozen lemonade concentrate
12 ounce can frozen limeade concentrate
1 cup confectioners' sugar
4 egg whites
6 cups crushed ice
1 liter carbonated water
1 lime, sliced

In a 4 quart container, combine lemonade concentrate, limeade concentrate, powdered sugar, egg whites, and crushed ice; mix well. Cover and freeze at least 30 minutes before serving.
Spoon 2 cups slush mixture into blender. Add 1 cup of carbonated water. Blend until frothy. To serve rub rim of glass with lime slice, dip in salt, and fill glass. garnish with lime slices.