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Put the onion, garlic, thyme and rosemary into your slow cooker and sit the lamb on top. Pour over the lamb gravy. Put the lid on and cook for 8 hrs or until soft and tender.
Remove the lamb and set, covered, on a plate. Strain the liquid into a pan and simmer until slightly thickened. Serve the lamb thickly sliced or shredded (it'll be quite soft) with mashed potatoes, green veg and the gravy.