Grated Japanese Yam & Nori-Tama Bowl
It’s a sunny-side up? No, the white part is Japanese yam :)
Japanese yam has some kinds and they are called various name from one region to another.
There are three types mainly, (1) long and thin “Naga-imo”, (2) round like a fist “Tsukune-Imo”, (3) flat and like a ginkgo leaf “Icho-Imo”. Collectively it is called “Yama-Imo” in the broad sense.
* Beyond them, there is a wild Japanese yam called “Jinenjo” Dioscorea japonica, that is diffrent from (1)(2)(3).
“Yamato-Imo” is very confused word especially.
Such as that (3)Icho-Imo is called “Yamato-Imo” in Kanto region (includes the Greater Tokyo Area) , but in Kansai region (includes Kyoto and Osaka) “Yamato-Imo” means (2) Tsukune-Imo, also called “Yama-no-Imo”.
Not only by region but also by the people, the recognition is different. It is very complicated.
Grate Icho-Imo, then add dashi broth to taste.
is a collectively common name of some kinds of Japanese yama, Dioscorea japonica. 山芋（やまいも） literally “mountain yam”
is a kind of Yama-Imo. 長芋（ながいも） literally “long yam”
is a kind of Yama-Imo. 仏掌芋（つくねいも） literally “Buddha’s palm yam”
is a kind of Yama-Imo. 大和芋（やまといも） literally “Japanese yam” * Yamato is an ancient name of Japan.