Lemon Jello Salad

This is my favorite Jello it's almost like a desert. I make it all the time

2 pkgs lemon jello
4 c water
1 can crushed pineapple
3 c bananas sliced
miniature marshmallows

Topping:
1 cup pineapple juice
1 egg
1/2 c sugar
2 TBS. flour
1/2 pint whipped cream

Prepare jello according to pkgs. Drain the pineapple and save the juice. Add pineapple and sliced bananas. Spread layer of marshmallows on top. Put in fridge until fully set.
Topping:
Make topping by mixing flour and sugar in pan and then add egg and pineapple juice. Cook over medium heat stirring constantly until thickened. Let cool completely. Whip the cream until set and then add to the topping mixture. Stir in carefully. Then put on top of jello and serve.