Christmas Punch - cooking recipe

Ingredients

2 (6 oz.) cans frozen lemonade concentrate
2 (6 oz.) cans frozen limeade concentrate
1 (46 oz.) can unsweetened grapefruit juice
1 (46 oz.) can pineapple juice
1 qt. (32 oz.) water
3 qt. ginger ale
lime sherbet

Preparation

Blend juices and water; chill.
Add ginger ale just before serving.
Float a half gallon of lime sherbet on top of punch mixture.