When QNZ leg of lamb is ‘slash-boned’ (the opposite of tunnel-boned) and opened out, it cooks much more quickly than the full leg on the bone
This is done by further butterfly-cutting the topside and thick flank.
QNZ Lamb leg with bones removed, and each sub-primal intact, is not even in thickness so it cooks a little unevenly; the thickest parts - the topside and thick flank - take longer to cook than the thinner parts.
Pure South
Pure South Lamb Leg Boneless - New Zeala...