Wash and dry the steaks. If the skin of either has been cut through, fold the flap over neatly, and tie it round with a fine piece of string. Mix together the parsley, oiled butter, and a little lemon-juice. Season this mixture with salt and pepper, then spread it on the steaks. Put them into buttered bags, fold over the edges twice, secure them with paper fasteners. Put them on a grid in the oven, and bake them from ten to twenty minutes. Serve very hot.