FRESH BOILED MACKEREL
Clean the mackerel, sprinkle with vinegar, wrap in a floured cloth and baste closely. Boil for three-quarters of an hour in salted water, drain, and take off the cloth. Strain a cupful of the water in which the fish was boiled, and bring to the boil with a tablespoonful of walnut catsup, a teaspoonful of anchovy paste, and the juice of half a lemon. Thicken with butter and browned flour.