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Cut butter into flour as if making pie crust.
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In a separate bowl, beat egg yolk and sour cream well, than add to flour mixture. Mix until blended.
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Divide dough into 3 parts.
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Cover with plastic and refrigerate at least 3 hours.
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Prepare filling by combining sugar, cinnamon, and walnuts.
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Preheat oven to 375.
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Working with one portion at a time, roll dough into a circle 1/8 inches thick.
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Brush each circle lightly with melted butter and spread 1/3 of the filling on each.
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Cut each circle into 16 wedges, like a pizza.
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Starting from the large end of each wedge, roll up toward the point, jelly roll fashion.
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Place cookies on ungreased cookie sheet with the tip underneath so they don't unroll and bake 15 minute or until lightly browned.