Instant boiled mutton is a type of hot pot from Northern China. The cookware used for instant-boiled mutton had quite an interesting shape: almost like a huge bowl stuck onto an elongated cone. And the entire cookware was made of copper. When used, hot boiling stock fills the copper bowl and cooks the food. The heat used to keep the stock boiling comes from the charcoal in the lower half the copper “cone.” Smoke then escapes from the chimney on top of the “cone.”