What Is Katsuobushi (Dried Tuna Flakes)?
Katsuobushi is a Japanese ingredient made from a tuna species (usually skipjack tuna/bonito) that is filleted and boiled, smoked, then dried and fermented over several months until it becomes a rock-hard block.
Just before use, the hard block is shaved into thin flakes (kezuribushi) with a special tool. When poured into hot water, the thin flakes flutter in the rising steam; they are the main component of the Japanese stock called dashi.
Katsuobushi Nutrition
One hundred grams of katsuobushi contains approximately 356 kcal; it is very high in fish-derived protein and naturally contains the umami compound inosinate. Values are approximate.
How Should Katsuobushi Be Eaten?
Katsuobushi is generally used in moderate amounts as part of a balanced diet, usually in stock or as a garnish.
This is general information; katsuobushi is a food and is not a substitute for medical treatment. People with fish allergies should avoid katsuobushi and dishes containing dashi.
How to Choose Katsuobushi
Good katsuobushi flakes are pinkish brown, have a distinct smoky, fishy aroma, and are thin and flexible. Avoid faded or damp, sticky packages.
- The color should be a vivid pinkish brown.
- It should have a distinct smoky, fishy aroma.
- The flakes should be thin and flexible, not sticky or damp.
How to Store Katsuobushi
Store katsuobushi flakes in a dry, sealed bag in a cool place; after opening, keep them sealed because exposure to moisture and air quickly weakens their aroma.
Using Katsuobushi in the Kitchen
Katsuobushi is used most often in dashi stock (boiled with kombu and strained), sprinkled over takoyaki and okonomiyaki as a garnish, and served over chilled tofu (hiyayakko).
Why Do Katsuobushi Flakes Curl over Hot Food?
The finely shaved flakes are light, so steam rising from hot food makes them move and flutter; this appearance is also considered a sign of freshness and fine shaving.
Frequently Asked Questions
Is Katsuobushi Raw Fish?
No. It is a fully processed product that has been boiled, smoked, and dried and fermented over several months.
Are Katsuobushi and Bonito Flakes the Same Thing?
Yes. In English, “bonito flakes” refers to the shaved flakes of katsuobushi; it is the same product.
Is Katsuobushi Available in Türkiye?
It is available in limited quantities; packages of ready-shaved flakes may be found at Asian markets that sell sushi ingredients.