"Morisada Manko" (a kind of encyclopedia of folkways and other affairs in the Edo period written by Morisada KITAGAWA) had descriptions that 'sushi made through processes of making a pouch by cutting one side of abura-age, and putting vinegared rice mixed with chopped Juda's ear, gourd strips and so on in the pouch had been sold (in the city of Edo) since the last year of Tenpo era.
『守貞謾稿』によると、「油揚げの一方を裂いて袋状にし、木茸、カンピョウなどを刻みいれた酢飯をつめたすしを、天保の末年から（江戸市中に）売り巡る。