This outdoor stove is known as a rocket stove as it uses twigs instead of logs for fuel. It's also extremely easy to build.The L-shaped design of the chimney results in virtually smoke-free cooking, and since it requires minimal amounts of wood, it's rather sustainable and eco-friendly. The materials needed to build this stove are cheap and easy to find. It makes a good outdoor stove for cooking and grilling, or simply for keeping warm. In times of a disaster, this stove would provide an efficient backup when gas or electric stoves don't work.