This past October, I found myself in Yoshida Village standing before a tatara, a giant open-top furnace that was filled with charcoal and raging with such controlled ferocity that it could have been a set piece in Lucifer’s bedroom.

Deep within the belly of those orange flames sat a growing and mangled ingot that contained some exceptionally high-quality steel called tamahagane, or jewel steel, from which Japanese swords have been made for much of the country’s history. The presence of a usable ingot seemed unlikely, and if true, downright alchemic. All we had been doing for the last 20 hours was gently shaking iron sand and fresh charcoal onto the flames at timed intervals.