INGREDIENTS
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6 large eggs, separated
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1 cup (100 grams) sifted cake flour
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1/4 teaspoon baking powder
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1/4 teaspoon salt
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1 cup (200 grams) granulated white sugar
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1 teaspoon pure vanilla extract
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2 tablespoons water
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Zest of a lemon or orange (outer skin)
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3/4 teaspoon cream of tartar