On June 14, 2011, Yoshinoya in Japan started serving as a standard seasonal menu to be offered until the latter part of July."吉野家 夏の定番メニュー 「鰻丼」期間限定発売のお知らせ" . (Japanese) (pdf) YOSHINOYA HOLDINGS. June 9, 2011. Retrieved July 5, 2011.
On June 14 2011 Yoshinoya in Japan started serving as a standard seasonal menu to be offered until the latter part of July"吉野家 夏の定番メニュー 「鰻丼」期間限定発売のお知らせ"  (Japanese) (pdf) YOSHINOYA HOLDINGS June 9 2011 Retrieved July 5 2011