Ninben is a famous shop in Nihonbashi that specializes in katsuobushi. Katsuobushi is an essential ingredient for dashi. It's also used as a topping for vegetables, okonomiyaki, and much more. A friend gave this to us and we were very curious to try temaki made with katsuobushi instead of nori.
The pre-cut sheets of katsuobushi were very small and hard to work with.