Real wasabi is grated with light pressure in a circular motion on an oroshigane grater. The grating surface is made of dried shark skin Stock Photo - Alamy
Wasabi Grater Chojiro - Large 13 cm / Shark Skin | Crafted in Japan – Osara Australia
Wasabi: Why invest in 'the hardest plant to grow'? - BBC News
Sharkskin vs Metal wasabi grater shootout - Cookware - Food Talk Central
Wasabi Grater - Extra Large 27 cm / Shark Skin | Crafted in Japan – Osara Australia