Imo Youkan is one of a Youkan which is a Japanese confection. Its shape is like a brick. Imo Youkan is made by steamed sweet potatoes, Kanten powder (agar powder) and sugar. This desert is popular among Japanese. You can find it at Wagashi shop (Japanese cake shop). Japanese people eat Imo Youkan with Japanese green tea. How to make Imo Youkan is not difficult, some Japanese cook it at their home.