bonito flakes, dried

Katsuobushi is produced by a months-long process: skipjack tuna is cooked, smoked, dried, and inoculated with mold (Aspergillus glaucus) that ferments the fish further, intensifying its glutamate content and converting proteins to flavor compounds. The result is one of the most concentrated natural sources of umami available — the combination of glutamates and inosinate creates a powerful savory depth that is simultaneously subtle and profound. Dashi, made by steeping katsuobushi in near-boiling water briefly, is the foundation of Japanese cooking — miso soup, noodle broths, and countless simmered preparations are built on it. Shaved fresh over warm food (as in okonomiyaki toppings), the flakes dance in the rising heat, creating the characteristic motion that has become a visual symbol of Japanese street food. Even a small amount in a broth or sauce elevates the entire dish's savory depth without tasting identifiably fishy.