1 1/2 c. orange sherbet
1 (6 oz.) can frozen orange juice concentrate
4 ice cubes
3 (12 oz.) low calorie grapefruit carbonated beverage
1 c. cold water

In blender combine orange sherbet, orange juice concentrate, ice cubes, and cold water. Cover and blend until smooth. Pour into 6 tall glasses and pour carbonated beverage down sides of glasses.