Hot Pineapple Casserole

1 cup granulated sugar
1/2 cup plain flour
1 large can of chunk pineapple - drained
1 large can of crushed pineapple - drained
35 Ritz crackers or a butter cracker such as Captains Wafers - crushed
1 stick of margarine

Drain pineapple and then mix with sugar and flour.  Place in a greased casserole.  Melt margarine and mix with crackers.  Place on top of the pineapple mixture.
Bake at 350 degrees for 25 minutes.

This is really delicious with baked ham.