Wash and scrape the fish. Soak all night, changing the water at bed time for tepid and again early in the morning for almost scalding hot. Keep this hot for an hour by setting the vessel containing the soaking fish on the side of the range.
Wash next in cold water with a stiff brush or rough cloth, wipe perfectly dry, rub all over again with salad oil and vinegar or lemon juice and let it lie in this marmalade for a quarter of an hour before broiling.
Place on a hot dish with a mixture of butter, lemon juice and minced parsley.
