Many sushi restaurants were managed by one owner and were small-scale, and he was too busy to serve green tea and thus a large tea cup peculiar to sushi restaurants was born.
店主が一人で切り盛りする小規模な店が多く、お茶のお代わりまで手がまわらず、鮨屋独特の大型の湯呑がうまれた。