So - I've got 4 lamb shanks sitting happily in the slow cooker, with some carrott, celery, a lot of garlic and a swig of red wine. My question is how do I make a lovely sauce from what's left in the pot after the lamb comes out? When I've done shanks before, the juices left in the bottom have been very fatty and watery. Please can someone give me an idiots guide of how to turn this into a wonderful rich gravy/sauce/jus?