In my books, there are only 2 ways to roast a leg of lamb - with a hint of pink so it's juicy (30 minutes per kg/2lb) or cooked loooooong and slow until tender. Anything in between = dry, tough meat. This recipe is the Greek way of roasting lamb - slow roasted until tender, braised in a lemon garlic thyme broth that reduces down to a sauce. The sauce is completely different to the thick gravy you are probably used to. This sauce is not thickened with flour, it is lemony, herby and garlicky so it cuts through the richness of the lamb. This is easier and far more foolproof than traditional roast leg of lamb because you don't need to worry about overcooking it.