A rack of lamb is usually two and a half pounds, because the delicious ribs have been trimmed off by the butcher. With the ribs left on, it is around five pounds. A single lambchop is a half pounder, a pound with the rib left on.

Like fancy steak houses who serve Tomahawk steaks with the the beef ribs left on the T Bone steaks, for Superbowl Sunday, I am grilling lamb chops with the whole ribs left on, sliced into one inch thick lamb chops, Tomahawk style.

I am sure your butcher will be happy to provide you with this cut of meat for parties.
Dorper lambs are the only lambs that dont turn gamey when older, they can be called lambs for two years, other lambs one year, then classified as mutton.