You can roast in the black orb. Nice winter leg of lamb with garlic and rosemary - great for people coming round for dinner wondering why the bbq is smoking away in the garden when it's snowing!
Use the charcoal rack thingys to hold the coal at the sides, put the roast in a tin tray wrapped lightly in tinfoil, put it on the coal platform on a brick and cook until you are too hungry to wait any longer.
Alternatively, buy a Cobb and use it in oven mode. The fat dripping off the lamb collects in the lower ring where you have put potatoes. So you get very nice lamb and the best roast pots you have ever tasted.
(Can't believe I'm posting recipies on PPRuNe!)