Pineapple Upside-Down Cake

2 tablespoons butter
1 cup brown sugar
1 20 ounce can pineapple, drained, juice reserved
1 cup sugar
3 egg whites
3 egg yolks
9 tablespoons pineapple juice
1 cup plus 2 tablespoons flour
1 teaspoon baking powder

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Melt butter in a 9×9 square baking pan in a 350 degree oven. Add 1 cup brown sugar to the melted butter and mix well. Drain pineapple and reserve juice. Arrange drained pineapple over the brown sugar and butter mixture. Set aside. Mix sugar, egg yolks, pineapple juice, flour, and baking powder. Beat egg whites until stiff. Fold beaten egg whites into batter. Pour batter over pineapple. Bake for 1/2 hour in a 350 degree oven. Turn upside down and serve.