1For Jello: Dissolve the jello in boiling water (I heat it in the microwave to save time) in a large bowl. Add Sprite & refrigerate until thick but not set. The consistency should resemble syrup. Add bananas, pineapple, marshmallows, and oranges. Pour into 13x9 dish. Refrigerate until firm.
2For Topping: Cook ingredients over medium heat until thickened. The consistency should resemble custard. Let cook.
3When the jello is set and topping is completely cool, spread topping over jello & enjoy!