Today we went to check out a new beach for surfing. We had to round a place full of old coconuts and a man stood at a barrel burning them. So we were concerned and stopped to ask him out what he is doing.
He explained that he is producing coal for his boss. We thought how interesting and let him show us how to do so. Pretty easy. Have look yourself:
He is adding coconut shells in the barrel level by level until its full and is burning them in each level.
If all burned just cover it up with wet sand and wait until it cooled down.
Clean it from sand and it is ready for use.