It is actually two chops with their rib bones still joined at the top, where the spine is.
A Barnsley Chop will weigh about 2 to 3 pounds (900g to 1 1/3 kg) before cooking (3 pounds / 1 1/3 kg if mutton instead of lamb.)
Serve 1 per person.
Can be grilled, fried, baked or roasted.
Popularized by the Brooklands Hotel in Barnsley, in Yorkshire, England, a former mining town.