1 box Betty Crocker Super Moist cake mix
1 tall can crushed pineapple (unsweetened)
3 Tbsp. cornstarch
1 c. sugar
1/2 stick butter

Bake cake according to package directions. Cook pineapple, sugar and cornstarch until thick. Remove from heat and add butter. Cool completely before putting on cake. I double this recipe because I like the cake to be gooey.