Peggy's Salad

1 pkg. lemon jello
1 pkg. strawberry jello
1 cup boiling water
2 cups cold water---Let set.
1 cup miniature marshmallows
3 mashed bananas
1 can pineapple, drained
Topping:
juice from pineapple, 1/4 cup sugar, and 3 Tbsp. corn starch, boil. Set and cool. Whip 1 cup Dream Whip, stir into custard. Put on top of salad.