Chopping the onion in mid-air while holding it in your hand. I saw this on the PBS cooking show “My Greek Table” with Diane Kochilas. I searched for a video that would show it because I didn’t think I’d be able to describe it.
https://www.youtube.com/watch?v=ljnqjGsKf-0 The video that loads after this one is pretty good, too. You have to have a razor-sharp knife and excellent coordination.
Has anyone seen this or done it? For some reason, watching this process gives me major league creeps… like it’s reminding me of something horrible that I saw once and mercifully have forgotten. It’s fascinating, however.