I bought this from Williamsburg a few weeks ago. It's a handmade reproduction of a late 18th century fireplace "oven." It's made of tin and uses the reflective interior to help cook all sides of the meat while it is turned on an iron spit. This is a 12 lb turkey that's about 30 minutesf from being done. It took 2 hours at 325 on the thermometer and turned out awesome! The secret was basting the turkey with bacon grease!