All ingenius things are simple. So is tandoor.
Tandoor’s design has remained virtually unchanged for the past three thousand years. The recent modern technological modifications have merely improved tandoor’s heat conductivity and transformed the oven from stationary into portable. A fire is lit inside the oven. As wood chips are gradually burning and turning to coals they are generating strong long-lasting cooking heat while the oval shape of tandoor oven provides for superior heat conductivity making sure that food is cooked evenly.