The fact that it was drunk in the summer season after being cooled in a well and was treated as luxury product is seen from the story of 'Aona,' a program of kamigata-rakugo (traditional Japanese storytelling performed in the region of Kyoto and Osaka).
かつては夏の暑気払いとして、井戸で冷やされて楽しまれ、高級品として扱われていたことが、上方落語の「青菜」に伺える。