2) Add the lamb stew meat and continue to cook until the meat has caramelized just slightly.
3) Deglaze with the beer. Add the lamb stock, and tomatoes. Put the lid on and pop it into the oven. Stir it occasionally and cook for about 4 to 6 hours.
4) When done, grate the chocolate into the chilli, which by now should be sublime. Season with salt, to taste.
5) Ladle into bowls and top with the grated Cotija cheese. Serve with a nice cold beer, fresh cornbread, a salad and feel the flavours of Mexico transport you!