Soften butter and add sugar gradually. Add egg yolk and then flour. Set aside and let harden enough to handle easily for rolling. Break off a piece of dough the size of a walnut. Roll out and cross one end over the other to form a wreath. Brush top with beaten egg white, then colored sugar. Bake on greased cookie sheet at 200ºC . until very lightly browned. Recipe from Grandma Ruby Brush. ----