To preserve
duck, pour a layer of fat from the
casserole into the bottom of a small
terrine. Pack
duck on top, and strain the remaining fat from the
casserole over the
meat. Add additional melted
lard, if necessary to cover. Be sure there are no air bubbles in the fat, or the
duck will not be properly preserved. Cover, and refrigerate for at least 1 week to allow flavors to mellow.