Rikucho Ogasawara's Onigiri Iron Plate is even more convenient if you have two. This product was also featured in the famous Japanese magazines, "Sankyu!" and "Fujin Gaho."

Onigiri Iron Plate
https://www.shokunin.com/en/rikucho/onigiri.html
Media Publication Information
https://www.shokunin.com/jp/etc/media.html