INGREDIENTS
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1 1/2 cups cake flour, sifted
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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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1/2 teaspoon grapefruit zest
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3 tablespoons grapefruit juice
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3 egg yolks
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3 eggs whites
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1/4 teaspoon cream of tartar
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2 (6-ounce) packages cream cheese
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2 teaspoons grapefruit juice
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1 teaspoon grapefruit zest
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3/4 cup powdered sugar, sifted
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6 to 8 drops yellow food coloring
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1 (1-pound) can grapefruit sections, well drained