The word Tandoor means a cylindrical oven used for baking and cooking. Traditionally the fuel used in Tandoor is charcoal or firewood. Modern Tandoor ovens uses cooking gas and electricity also instead of charcoal.a cylindrical clay oven in which food is cooked over charcoaltandoori cookery, an Indian method of cooking over a charcoal fire in a tandoor, a cylindrical clay oven. Shaped like a large urn, a tandoor is at least 1 metre (3.3 feet) in height and is often sunk up to its neck in the earth.Set fire to the kindling and gradually add more kindling, while maintaining a small fire for at least 30-40 minutes. The goal is to warm the walls and the bottom of the tandoor evenly, and only after that you can begin to gradually raise the flame to the neck, increasing the amount of kindling and firewood.A tandoor is a cooking cylinder made of clay or masonry, with the heat source on the inside and very thick, well-insulated walls. The food is placed into the oven through a hole in the top, which also serves as the chimney. ame or coals and these days many of them are powered by a gas flame inside the cooking chamber.