Katsuo, called bonito, or as my fishmonger husband says, skipjack tuna, is a meaty fish. It's in the tuna family and is a good fish to try as sashimi if you are looking to go beyond tuna and salmon.
At the market it can be sold raw, as this is, or as tataki where it is seared or cooked over a straw fire until just the edges change color.
We put this over chopped iceberg lettuce and wakamé. It is garnished with garlic sliced thin on the Benriner, grated ginger, and minced shiso. We dress it with soy sauce, sesame oil, and rice wine vinegar.