Lemon Jello Salad

This is a recipe from my college roommate who is a wonderful cook.  She served this when I was visiting her once and it is delicious.  Jello salad is old fashion, I think.   You don't see recipes for jello salads anymore or I don't.  I remember as a kid my grandmother always having a bowl of red jello on the dinner table.

2 small packages lemon jello
1 large can pineapple tid bits or crushed and drain and reserve liquid
1 egg
1/2 cup sugar
1 1/2 tablespoons flour
11/2 cups miniature marshmellows
small container of cool whip
1 cup shredded cheddar cheese
3 bananas, sliced
pecans, chopped (optional)

Dissolve jello in 3 cups of hot water.  Cool.  Add one large can of pineapple tidbits or crushed.  Add marshmellows and sliced bananas to jello.  Mix well and pour into a 9x13 casserole dish and chill until firm. 
In a saucepan, add reserve pineapple juice add flour and mix well and then add sugar and one beaten egg and mix well.  Cook over medium heat stirring constantly until mixture thickens.  Let this cool.  When it is cool fold in 1/2 container of cool whip. 
When gelatin has set up then spread the above mixture over the top of the gelatin.
Then cover the top with the cheddar cheese.  Sometimes it takes a little more than a cup.
If desired, you can sprinkle chopped pecans lightly over the top.

You can cut this is squares and serve on a lettuce leaf.  It serves 12.