Hi 976bar, I cook pork shoulder(supermarket) once a week in the slow cooker, but it normally takes around 6hrs to become really soft. It's definitley a great way to cook otherwise tough cuts of meat. Lamb could be cooked in it in minimal liquid, but that recipe is an actual bir lamb & spinach karahi & needs attention to stop the sauce reducing too quickly before the meats done. The puree of tomato & onion starts off much thicker than an onion gravy. R Stein said on the original program that he'd never seen a curry cooked this way before, whether he was talking about bir curry i'm not sure. It's the best curry I've made outside the home bir stuff by a long way
Regarding the lamb and pre-cooking I use my cheap slow cooker and cook the lamb pieces with a little base sauce and maybe a few whole spices. When I add the meat to the curry all the lamb juices in the slow cooker will go into the curry so there is no lack of lamb flavour or loss of juices.
IMO lamb needs quite a long cooking time to become tender.
Paul
That would improve this recipe for the home cook paulp
Regards
ELW