Never use the white part of the peel of a lemon for flavoring. It is bitter. The little globules of oil in the surface of the rind contain all the pleasant flavor of the peel. It may be thinly pared off, avoiding the white pulp. Professional cooks, how-ever, rub loaf-sugar over the surface. The friction breaks the oil-ducts, and the sugar absorbs the oil. It is called zest. The sugar is afterward pounded fine for certain dishes, such as creams, meringues, etc.; or it can be simply melted in custards and beverages.