Overview: Sushi has gone global. So people around the world know familiar light green wasabi as a condiment with a kick that's indispensable to the sushi and sashimi experience. The Izu Peninsula is one of the leading wasabi farming areas in Japan. But why? And what does the local geology have to do with this indigenous Japanese plant? In this episode, the Ground Detective travels the Izu Peninsula looking for clues to solve the case of the wasabi.