1 pkg. Jello pudding and pie filling (not instant) vanilla flavor
1 pkg. lime Jello
2 c. water
1/4 c. sugar (optional)
2 tbsp. lime juice
3 1/2 c. Cool Whip
1 (9 inch) chocolate crumb crust

Combine pie filling mix, gelatin, sugar and water in saucepan. Cook and stir over medium heat until mixture comes to full boil. Add lime juice. Pour into bowl, cover with plastic wrap and chill until cold and slightly thickened.

Fold in 2 1/2 cups of the whipped topping. Spoon into crust. Freeze 1 hour or chill in refrigerator 3 hours before serving. Garnish with remaining topping and lime slices if desired.