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Nagano
Katsudon with a sauce made of the local foodstuff of Komagane.
Sauce katsudon
Katsudon with a special sauce made with carefully selected "local foodstuff from Komagane." Katsudon usually referrers nikatsu with eggs, but this katsudon is flavored with a sauce and is known as the origin of katsudon. It is said to be invented by a student of Waseda high school, Keijiro Nakanishi and his friends, and it was served for students at cafeterias then, and was spread nationwide.
Information provided by : Gurutabi