STEWED CODFISH À LA LINCOLN

Clean and bone four pounds of fresh codfish. Slice and scald two small onions, drain and fry soft in salt pork fat. Cut the fish into cubes and season with salt and pepper. Boil the bones in water to cover, with onion and pork fat. Put the fish into a buttered sauce-pan and strain the boiling liquid over it, using enough to cover. Add the juice of half a lemon, and thicken with one heaping tablespoonful of butter cooked with two of flour. Season with salt, pepper, minced parsley, and tomato or mushroom catsup. Just before the fish is done add one quart of drained oysters and cook until the oysters are plump.