1 pkg. each lemon and lime Jello
2 c. boiling water
2 c. 7 - UP
1 (no. 2) can crushed pineapple, drain and save juice
1 c. marshmallows
1 sm. can mandarin oranges, drained
2 bananas, sliced
1 c. reserved pineapple juice
2 tbsp. corn starch or flour
1/2 c. sugar
1 egg
1 pkg. Dream Whip

Mix Jello with boiling water; let cool. When cool, add 7 - Up. Add pineapple, marshmallows, mandarin oranges and sliced bananas. Put into 9 x 13 inch pan and set up in refrigerator. For topping, boil reserved juice, corn starch or flour and sugar until thick; cool. Beat package of Dream Whip until thick. Fold in boiled sauce and spread over Jello when set. May add chopped nuts to top.