Place the Kadai on a level surface. Cover the bottom of the Kadai evenly with approx. 5cm of builders sand; do not use beach sand as this contains salt. Using sand has several benefits e.g. heat will be retained for longer, it raises the level of charcoal, wood burns better on sand than it does directly on metal.Make a pyramid using paper with kindling, then light. When the kindling starts to burn, add larger pieces of wood.