(18-1/4 oz) yellow cake mix, prepared as directed, any size pan
(20 oz) crushed pineapple
1after cake has cooled add the crushed pineapple (including the juice) sugar, cornstarch and flour in a saucepan.
2heat over low medium heat until thickened. stir frequently to keep the sugar from burning. when thickened remove from heat and allow to cool slightly. frost the cake.