Japanese Ingredients: Katsuobushi - Japanese Cooking 101
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How to make dashi / stock recipe - Authentic Japanese technique - カツオと昆布の合わせだし
Katsuobushi is dried, fermented, and smoked skipjack tuna. It is also known as bonito flakes when young bonito is used as a cheaper substitute for skipjack tuna. Katsuobushi or similarly prepared fish is also known as okaka (おかか).