Katsuo (Bonito) is "Shun no tabemono" now. We call it "Hatsugatsuo" 初鰹. We normally eat it as one kind of sashimi. We call it Katsuo no Tataki. Katsuo no Tataki is raw, however, only surface of a piece of Katsuo is grilled. The relish of Katsuo is grated garlic. I like sashimi and Hatsugatsuo is so delicious.
There is a famous Haiku of Katuo.
目に青葉 山ほととぎす 初鰹
(Meni aoba Yama hototogisu Hatsugatsuo)It expresses early summer in Japan.
We can see a lot of green leaves (青葉) outside, Lesser Cuckoo (ほととぎす) chirps in mountains and Bonito is in season (初鰹）.
What is "Shun" of early summer in your countries ?