1/2 c. sugar
1 (3 oz.) pkg. lime flavored gelatin
2 c. boiling water
3 c. unsweetened pineapple juice
1/3 c. lemon juice
1 c. cold water
1 (64 oz.) ginger ale, chilled

Dissolve sugar and gelatin in boiling water in a large bowl. Stir in juices and cold water. Cover and freeze 8 hours. Remove from freezer 1 hour before serving. Place in a punch bowl and break into chunks. Add ginger ale, stir until slushy.