Pineapple Cake
["1 box yellow cake mix", "1 large can crushed pineapple (20 oz.)", "1 1/2 c. sugar", "1 stick margarine", "2 Tbsp. flour", "2 egg yolks", "1 can coconut (add last)"]
["Mix all ingredients except coconut together and bring to a boil.", "Lower heat and continue to cook, stirring until it thickens.", "Remove from heat and add coconut.", "Pour over cake which has been prepared according to directions on box in 9 x 13-inch pan at 350\u00b0."]
["yellow cake mix", "pineapple", "sugar", "margarine", "flour", "egg yolks", "coconut"]