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Though not done in a slow cooker, there is a classic French dish, called spoon leg of lamb, that I made for my Mom a number of times. I made it in an elongated Dutch oven, which fits a leg of lamb perfectly; if you have one of those elongated slow cookers, that would be good. It is first browned in the pan - if using a slow cooker, you'll want to brown it in a cast iron skillet, or something similar - then a few vegetables are added to the pan, to keep the meat off of the pan, some wine is added, as well as any seasonings desired, then the covered pan is baked in a 225° oven for 7 hours (not sure how long in a slow cooker - temperatures vary between models). The lamb is so tender that it can be served with a spoon, thus the name. The early slow cooker!