INGREDIENTS
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1 large sweet potato (about 10 ounces), peeled and cut into 2-inch chunks
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1 medium apple (about 8 ounces), such as Granny Smith, peeled and cut into 2-inch chunks
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1/8 teaspoon salt
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1/2 teaspoon ground allspice
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3 tablespoons granulated sugar
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1 large egg yolk, plus 4 large egg whites
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2 tablespoons all-purpose flour
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1 teaspoon confectioners' sugar