So popular as a fast food is beef on rice that the "gyudon war" waged by its top three vendors — Sukiya, operated by Zensho Holdings Co., Yoshinoya of Yoshinoya Holdings Co. and Matsuya, run by Matsuya Foods Co. — is a frequent media topic.
Following are some questions and answers about the beef bowl battle.
When did the gyudon war start heating up?
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