Honing a Knife to Realign the Edge (Knife Skills Series, Ep. 1)

From a channel Lumen includes in full: Helen Rennie, a cooking teacher, explains the science and technique behind home cooking (heat, texture, dough, sauces) in clear, tested lessons.

A 12-minute video from Helen Rennie's catalogue; the title names its topic.

Video by Helen Rennie, played through YouTube's embedded player.