INGREDIENTS
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8 tablespoons (1 stick) unsalted butter, at room temperature
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1/2 cup packed light brown sugar
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1 large egg, separated
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1 teaspoon vanilla extract
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1 1/4 cups all-purpose flour
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1/4 teaspoon salt
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3/4 cup walnuts, finely ground
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1 tablespoon sugar
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1/4 cup apricot or seedless strawberry jam