Lit.: "beef bowl": a Japanese dish consisting of rice covered with beef and onion simmered in a mildly sweet sauce flavored with soy sauce and mirin. It's a very popular dish in Japan, where it can be found in many restaurants and fast food chains.
Glossary: gyuudon
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gyuudon (牛丼)
Referenced from: Mirage: Shinku no Hata wo Hirugaese
Bibilo: Drivein Gyudon, Gyudon (english)