Pineapple Upside-Down Cake
["1/4 pound butter", "1 c. brown sugar", "1 medium can sliced pineapple", "3 egg yolks", "1 tsp. baking powder", "1 c. flour", "1 c. sugar", "5 Tbsp. pineapple juice"]
["Melt butter slightly in heavy 10-inch skillet.", "Spread with brown sugar and layer of pineapple rings.", "Blend remaining ingredients well.", "Fold in 3 stiffly beaten egg whites.", "Pour over mixture in skillet and bake at 350\u00b0 for approximately 1 hour.", "Test with toothpick.", "Turn upside down on cake platter."]
["butter", "brown sugar", "pineapple", "egg yolks", "baking powder", "flour", "sugar", "pineapple juice"]