Charcoal

Charcoal was one of the unorthodox ingredients which Moses of Tyre included in his creative attempt to replicate "Greek fire" in the 12th century as part of a battle against Krynoids. The result was a more potent, explosive substance. (AUDIO: The Green Man)

The Saxon Master referred to one of his previous incarnations as "Mister Charcoal Grill". (PROSE: The Secret Diary of the Master)