Hāngi

Hāngī is a traditional New Zealand Māori method of cooking food using heated rocks buried in a pit oven, called an umu. It is still used for large groups on special occasions, as it allows large quantities of food to be cooked without the need for commercial cooking appliances. To "lay a hāngī" or "put down a hāngī" involves digging a pit in the ground, heating stones in the pit with a large fire, placing baskets of food on top of the stones, and covering everything with earth for several hours before uncovering (or lifting) the hāngī. Hāngī "experts" have developed and improved methods that have often, like the stones themselves, been handed down for generations.

Source: Wikipedia