On board mixing sift flour, add the starch and sugar, ground walnuts. Top cut pieces of the butter and add the yolks. Begin to interfere until the dough becomes smooth. Let dough for one night in a cool place to rest. The next day we make the dough cylinder and cut the same size wheels that do Sticks 6-7 cm. Long and 1 cm thick and turn rings (in the form of the letter C). Bake on nenamaslena pan, over medium heat until it turns rosy (do not make a lot of brown, not harden). While still hot roll them in the prefabricated powdered sugar with vanilla. * are stored in a cardboard box in a cool place. Withstand at least a month, month and a half * The more you stand on - are good. Be careful only when they Oval powdered sugar, because they are very fragile and can break. * They are suitable for Christmas, because last long and are incredibly delicious. * With thanks to Nat for the wonderful recipe.