Nearly-carbon-zero fuel such as charcoal is one of the many outputs produced at Daruma, used by us frequently for barbecuing.

Charcoal, Fire, Lye & Barbecuing

Charcoal has been used to make fires for thousands of years of human history. High temperatures made it useful in the Iron Age. High temperature & lack of smoke when burning, and higher energy density compared to wood, make it very attractive as a fuel for cooking.