INGREDIENTS
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2 cups cake flour
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1 1/2 cup granulated sugar, divided
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2 teaspoons baking powder
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1/2 teaspoon salt
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6 eggs, separated
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2/3 cups canola oil
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2/3 cup, plus 1 tablespoon fresh grapefruit juice, divided
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2 teaspoons lemon zest
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2 teaspoons vanilla
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1 teaspoon cream of tartar
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1 1/2 cup powdered sugar
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1 teaspoon fresh mint, minced