Pineapple Upside-Down Cake
["3 Tbsp. butter", "1/3 c. brown sugar", "1 large can sliced pineapple", "lemon cake mix (mix as directed)"]
["Melt butter with brown sugar.", "Spread evenly over bottom of 13 x 9-inch pan.", "Arrange slices of pineapple on sugar mixture.", "Pour cake mix over pineapple.", "Bake at 350\u00b0 for 35 minutes.", "Cool 10 minutes.", "Invert onto cardboard covered with waxed paper."]
["butter", "brown sugar", "pineapple", "lemon cake"]