Butter, salt, flour and water.

Trim the joint neatly, wipe it well with a cloth, rub it over with butter, and sprinkle it with salt; then wrap it up in a sheet of buttered kitchen paper. Make a paste with flour and water, roll it out to the thickness of about half an inch, wrap the joint in this, and close up all the openings carefully by wetting the edges of the sheet of paste; lastly, pack up the haunch into a sheet of well buttered paper, put in the oven for about three hours, basting occasionally, then remove the paste and paper coverings, baste the haunch plentifully with butter, and when nearly done dredge some flour over it and some salt. Serve on a hot water dish.