I've used this one for years...using the coal bed of a fire, I have cooked a whole Roast, whole chicken, Pork loins, Baked cakes, potatoes and biscuits, pretty much anything a regular oven can do.....(Just have to downsize to what will fit in the oven space).
http://home-and-garden.webshots.com/alb ... 1842ZDtjxW
This is webshots don't know If I can link to them...we'll see....