Mix ¼ pound of butter with 6 tablespoonfuls of sugar. Add the yolks of 5 eggs, ½ cup of milk, ½ pound of sifted flour with 2 teaspoonfuls of baking-powder, a pinch of salt and the grated peel of a lemon. Mix well; add the whites beaten stiff and bake in a well-greased waffle iron. Sprinkle with pulverized sugar and serve hot.