INGREDIENTS
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1 1/4 cups sifted cake flour (not self-rising)
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1 1/2 cups packed light-brown sugar, sifted
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14 large egg whites, room temperature
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1 1/2 teaspoons cream of tartar
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Pinch of salt
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2 teaspoons finely grated lemon zest
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, for serving Candied Citrus Slices
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16 ounces creme fraiche