Vanda Seafood Sells a wide variety of foods one like Katsuoboshi @ 500gr
It is a processed product from skipjack tuna which is dried and shaved from fresh fish.
Can be consumed directly, usually sprinkled on Takoyaki / Okonomiyaki / Sushi dishes.
Katsuobushi is rich in Vitamin B complex and containslots of inosine and umami elements so it is always used in Japan as a kitchen spice or flavoring. In Japanese terms, umami is a "delicious" taste that is an additional taste to the four common main tastes: sweet, sour, and salty.