Nachikatsuura City is one of the biggest producers of tuna in Japan. The city is known for its number of the tunas caught, and the tuna has a reputation for its taste. Magurochutoro katsudon is made with chutoro finished up like katsudon. Inside the crunchy batter coating, you will find tender rare tuna. The flavor of tuna comes after the crunchy texture of batter coating, so you can enjoy this dish in two different ways. The specially made Tosazu jelly which comes on the side has a light and refreshing flavor, that will give you a refreshing taste after all.