Pineapple Upside-Down Cake
["1 can crushed pineapple", "1/2 stick butter", "1/2 to 3/4 c. brown sugar, not packed", "yellow cake mix"]
["Prepare cake mix according to package directions and set aside.", "Melt butter in a 9 x 13-inch pan and sprinkle brown sugar over entire bottom of pan.", "Put crushed pineapple on top of brown sugar (juice and all).", "Pour cake batter over pineapple and bake in a 350\u00b0 oven for 25 to 30 minutes.", "Have a cookie sheet or long pan ready when you take cake out of oven and immediately turn cake onto sheet."]
["pineapple", "butter", "brown sugar", "yellow cake"]