1/2 c. sugar
2/3 c. water
2/3 c. lemon juice
2 tbsp. lime juice
2 egg whites, unbeaten
4 c. ice, finely crushed

Cook sugar and water for 5 minutes. Chill. Add remaining ingredients. Pour half of the mixture into a blender and blend 7-8 seconds until light. Add rest of ingredients and repeat. Serve at once in chilled cocktail glasses with short straws.