Coffee charcoal.

Over $3/pound... I'm out regardless of how awesome it might be.

Sounds like it would be more for grilling since it gets hot so quick, but as teleking said, it's really expensive. The grounds are a by-product that they get for nothing.

Hey everybody, I've got an idea!!! Lets all start using our spent Keurig k-cups as briquettes. That would be cost effective and would help save the planet too!