Linked from
The 8 pages that link to Katsuobushi, each with the reason it gives.
Japanese cuisineRelated: Its flakes contribute aroma and flavor to dashi and other preparations.
DashiRelated: Its flakes release aroma and inosinate into classic dashi.
OkonomiyakiRelated: Heat makes the flakes curl and move atop freshly cooked okonomiyaki.
TakoyakiRelated: Its thin flakes are a common topping that curl and move in rising heat.
Miso soupBroader topic: Its flakes are steeped with kombu to make a common dashi for the soup.