INGREDIENTS
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2 1/4 cups cake flour
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1 1/2 cups sugar
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2 teaspoons baking powder
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1/2 teaspoon salt
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8 large eggs, plus 1 white, at room temperature
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1/2 cup vegetable oil
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3/4 cup fresh orange juice
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3 tablespoons grated orange zest
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1 teaspoon vanilla extract
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1 teaspoon cream of tartar
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1/2 cup fresh orange juice
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1 pound confectioners' sugar, sifted