Blast, please consider an autopsy of the root. Is it completely carbonized? Is there a gooey, yummy center? Please relay to us both the smell and taste of several sections - for scientific reasons of course.
Edit: I understand table saws are approved tools for tough autopsies.
It was carbon almost all the way through, though the center was still charred woody/fibrous material. It had a very pleasant smell kind of like a mixture of caramel and dark roasted coffee. My shirt still holds that smell. I'm wondering if there'd be a market for greenbriar incense.

The taste was charcoalish with hints of earthiness, I don't see a market for that except for people looking for a new experience with their smoker. Hmmm, note to self: send some greenbriar tubers to dad.
The remains have been added to the compost bin from which they may someday return to my plate.
-Blast, who plans on harvesting some bamboo tomorrow if the weather is good. DW already has the bandages ready.