One theory is that its history started when the 12th lord of the Tosa Domain, Toyosuke YAMAUCHI, was served this appetizer in Tosashimizu and he named it Shuto, but this story lacks credibility as Toyosuke was born in 1794.
一説には土佐の第12代藩主、山内豊資（とよすけ）が土佐清水でこれを振舞われた際に名づけたという伝承があるが、豊資は1794年生まれである為信憑性に乏しい。