This is must buy at Asakusa.
Imo Yokan was designed as an alternative of Yokan(a bar of sweet jellied adzuki-bean paste) when the latter was expensive.
Decent sweet taste different from sweet potato. You can buy them at famous Department stores in Ginza and Nihonbashi etc.
Restaurant’s Name:Funawa(舟和)
Address:1-20-1,Asakusa,Taito-ku,Tokyo
Operating hours:10:00~18:00
Holidays:Open throughout the year