A very expensive, very efficient grill/smoker. Nice but really a luxury not needed to make good smoked/ grilled food.
It's a fancy, shmancy ceramic cooker, that uses charcoal. I don't understand why they are so expensive, but they are. Seems like a good idea, using ceramic to keep the heat in, but, I'll never know the pleasure. It's called the Big Green Egg
A toilet tank would hold heat, and has a ceramic lid. Guess a bowl would work too, but no lid, and you would have to burn all the "crap" out of it. I see free toilets on Craigslist all the time. I think a toilet would make a good outdoor fire pit, but I don't know about eating out of a used toilet, lol