7-Up Jello Salad

Ingredients
1 lg. or 2 sm. pkg. lemon Jello
2 c. boiling water
16 oz. (2 c.) 7-Up
2-3 sliced bananas
1 sm. crushed and drained pineapple (save juice)
2 tbsp. instant flour (Wondra)
1 c. pineapple juice
1/2 c. sugar
1 egg
Preparation:
Dissolve Jello in boiling water. Add 7-Up. Cool. Pour into 9×13 inch pan. Add bananas and pineapple. Cover with miniature marshmallows. Refrigerate until set. In a saucepan, mix above ingredients. Cook all until pudding consistency. Take off heat. Add 2 tablespoons butter and stir. Cool. Spread this over marshmallow layer. Top with 4 oz. grated American cheese (buy it by the chunk in Deli).