I watched a doco on the traditional methods of making charcoal . They had a huge pile of sticks and covered it with wet coconut husk and then wet sand lit it from the top by dropping burning sticks and then covering it with the coco husk and more sand to seal it.
They had small air holes near the bottom and some near the top and checked it throughout the approx. 21 days finally covering the air holes and waiting for it to cool down.
Is this biochar?
