INGREDIENTS
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1-1/2 cups sifted cake flour
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3/4 cup sugar
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1-1/2 teaspoons baking powder
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1/2 teaspoon salt
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1/4 cup water
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1/4 cup vegetable oil
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3 eggs, separated
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3 tablespoons grapefruit juice
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1/2 teaspoon grated lemon rind
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1/4 teaspoon cream of tartar