MACKEREL EN PAPILLOTES

Oil a sheet of paper a little larger than the fish. Lay a slice of cooked ham on each piece of paper, and spread with chopped onion, carrot, parsley, and green pepper fried together in butter. Lay a mackerel on the ham, spread with the fried vegetables, cover with another slice of ham, and fold the paper over, twisting the ends. Bake for fifteen minutes in a moderate oven. Serve in the paper.