These cookies make great Christmas gifts. Mix in the sour cream and the egg yolk. Divide the dough into four parts, wrap in plastic wrap, and chill for several hours. Mix together the brown sugar, walnuts, and cinnamon. Cut the dough into pie-shaped wedges and roll, beginning at the wide end.
Place cookies on an ungreased cookie sheet.
Bake for about 20 minutes at If you remove the cookies from the oven before they turn brown, the dough will be softer and flakier. If you remove them after they have browned slighly, the dough will be crisper. Remove cookies from cookie sheet before they have cooled completely, or else they stick to the cookie sheet. Notes During my childhood, these cookies tasted wonderful. However, now they strike me as a bit sweet.