Inaka Dictionary: 三枚卸 sanmai oroshi
Anyone who lives in Japan’s inaka (countryside) knows how to cut up their own fish! San-chan’s on Shiraishi Island shows us how to do sanmai oroshi. Note that, although not shown in the video, the fish is then turned over and the other side is cut the same way, then the head cut off so you have 3 parts of the fish. This fish is Hirame (Halibut) and is fresh out of the Seto Inland Sea.