INGREDIENTS
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1½ cups unbleached cake flour*
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1½ teaspoons baking powder
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⅛ teaspoon salt
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½ cup unsalted butter, at room temperature
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⅔ cup granulated sugar
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2 large eggs, at room temperature
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¼ teaspoon lemon extract
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1½ tablespoons milk
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2 baking apples; peeled, cored, and sliced
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4 to 6 walnut halves, optional
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3 heaping tablespoons apricot preserves
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1 teaspoon unflavored gelatin
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2 tablespoons cold water
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1 tablespoon confectioners sugar