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Cut margarine into flour.
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Add egg yolk and sour cream.
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Shape into 4 balls and let them chill in the refrigerator (usually overnight).
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Roll balls into a circle so the dough is thin.
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Combine the sugar, cinnamon, and walnuts in a separate bowl.
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Sprinkle the dough with the nut mixture.
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Cut the dough into 16 triangle pieces.
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Roll each section.
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Once placed on cookie sheet, brush with the egg white and if desired, sprinkle a little bit of the nut mixture on top.
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Bake 25 min at 350.