Briquettes Used as Cooking Fuel
Puzzle 9 of Architectural Styles Hard Pack
Question is: Briquettes Used as Cooking Fuel
and the answer is: CHARCOAL
Word Meaning:
CHARCOAL — (countable, uncountable) impure carbon obtained by destructive distillation of wood or other organic matter, that is, heating it in the absence of oxygen.
Definitions from Wiktionary.