This is how food is sometimes cooked in the middle east and India
Cooking food at a high temperature in a clay pot can be traced back over 2000 years to when the Egyptians were building the pyramids and baking bread for the workers. It is the most simple and fundamental way of cooking, using a clay pot buried in the ground, fired up with wood.
A tandoor (Persian: تنور, Hindi: तन्दूर, Urdu: تندور) is a cylindrical clay oven used in cooking and baking. The tandoor is used for cooking in India, Turkey, Iran, Pakistan, Afghanistan, the Transcaucasus, the Balkans, the Middle East, Central Asia as well as Burma and Bangladesh.
from the website Home - Babaclayoven