7-Up Salad

2 small packages Lemon Jell-O
2 cups Boiling Water
2 cup Chilled 7-Up
1 cup Mini Marshmallows
2 Sliced Bananas
1 (20 oz) can Crushed Pineapple

Topping

1/2 cup Sugar
2 tbsp Flour
1 cup Pineapple Juice
1 Beaten Egg
2 tbsp Margarine or Butter
1 cup Whipped Cream

Dissolve Jell-O in boiling water in 9 by 13 pan. Add 7-up. Drain pineapple, but reserve juice for topping. Add pineapple, bananas, and marshmallows. Set. After set, Cook sugar, flour, juice, and egg until thick. Stir in butter. Cool, fold in whip cream. Add topping to jell-o