My friend Dug North shared this video on YouTube at the request of another friend. It is unedited and a bit long, but it’s a fascinating technique that requires only a knife and a segment of bamboo.
Like a lot of friction-fire techniques, the prep is important (and a tad fiddly) and it takes a while to get the hang of it, but it looks as though, once you learn it, it’s really not that hard.
Image: YouTube