Forget a special cup. Enjoy sake with wine glasses!
You may think that you need a special cup to drink sake.. Actually it's not necessary! Well, a brew-master uses Janomeno kikijoko which is a traditional sake cup with blue and white lines to check color tone of the sake. However, the International Standards Organisation (ISO) defines glasses for tasting wine, stemmed glasses with elongated tapered bowls, and these glassed are applicable to sake too. Same as wine, sake also has recommended glasses depending on its characteristic and SSI (Sake Service Institution) recommends as follows:
Then why is sake served in a special cup and a bottle at a Japanese restaurant? This is based on our culture. It's said that people already used Ochoshi, a kettle made from wodden or metal to drink sake during Heian period (794-1185). People used an Ochoshi with a single spout at a court and the one with double spouts at a casual drink occassion. An Ochoshi with a single spout is still used for a traditional ceremony in Japan.