Previously, when I made yaki-onigiri, I used to cook them on a gas stove fish fryer, but since the Onigiri Iron Plate came, my favorite Benkei-meshi and soy sauce onigiri cook up beautifully and I use it when I have leftover rice!
M.Y. in Yamagata Prefecture, Japan

Rikucho Ogasawara's Onigiri Iron Plate
https://www.shokunin.com/en/rikucho/onigiri.html