Pound in a mortar one sprig of parsley and three hairs of chervil; add three medium-sized vinegar-pickles, half a small, white onion, one anchovy, and a teaspoonful of capers. Mix these with soaked bread the size of an egg, and pound all well together. When the preparation is reduced to a paste, rub it through a fine sieve, put it in a bowl and stir well, adding half a cupful of sweet oil, two tablespoonfuls of vinegar, half a teaspoonful of pepper, and half a tablespoonful of salt. This sauce must be consistent and ox a green color.