When I first came to Japan, I lived in a Tokyo shared house with a small kitchen which made cooking difficult. Most of my meals were either eaten out or bought already made at the local grocery store. Japan had a lot of interesting foods, and I wanted to try them all. Not being able yet to read Japanese, I one day bought what looked like seared tuna. The fish, which was in fact katsuo, was served with green onions and tasted quite fishy. In order to avoid this mistake, I made a point to tell tuna and katsuo apart from that day on. Years later, on a visit to Kochi, my friends reintroduced me to katsuo tataki. I tried it with some reticence but to my surprise it was delicious. Why was Kochi’s katsuo so delicious when Tokyo’s was not?