"This is a rather delicate version of the classic Hungarian filled cookie for the holidays...."
INGREDIENTS
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2 cups ground walnuts
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1/2 cup sugar
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3 large egg whites, lightly beaten
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2 tablespoons regular or low-fat milk
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1/2 cup golden raisins
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6 cups flour, sifted 3 times, plus more for the work surface
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6 tablespoons sugar, plus more for decorating
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1 teaspoon baking powder
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1 pound unsalted butter, cut into 1-inch pieces
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5 large egg yolks
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1 cup regular or low-fat sour cream
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Finely grated zest from 1 lemon