Guinness lamb shanks

Back to Jamie's Great Britain.  I am slowly but surely reappraising my feelings about Jamie in general, slowly becoming a fan due to the fact that his recipes just work and seem to be full of flavour - I may have said this before and promptly forgotten!  So, I made this for my sister, who for medical reasons needs slow cooked meat, with a minimum of veg.  I therefore slightly adapted this recipe to make a much smoother gravy but it was absolutely beautiful.