Mitaka Shokudo
A legendary Koriyama diner founded in 1962, famous for enormous portions. The signature sauce katsudon (1,100 yen) features a massive cutlet overflowing the bowl. Featured on TV. Many customers have been regulars for 50-plus years.
Reviewers are wowed by the katsu overflowing the bowl and the timeless flavor that keeps people coming back. Called a must-visit whenever in Koriyama.