Make a roux by frying two ounces of butter and two ounces of flour, add an ounce of grated cheese and half a cup of good stock. Mix up well so as to form a paste, and then take it off the fire and add the yolks of four eggs, mix again and form the again and form the paste into little quenelles. Boil these in a little soup, strain off, put them into the tureen and pour a good clear soup over them.