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Blackfin Tuna Sashimi
Zachery Dyke
Blackfin Tuna Sashimi (With Ponzu & Jalapeño)
This Blackfin Tuna sashimi recipe is a fresh, restaurant-quality appetizer you can make in 5 minutes using sushi-grade tuna, homemade ponzu, and thin-sliced jalapeño. This is a variation of one of my favorite appetizers to order when I go out for sushi: Hamachi Jalapeño.
This recipe is great because it is so simple to make and can be served as an appetizer for gatherings. You can double, triple, or even quadruple the amount of Tuna you use and you should still have plenty of sauce, and probably Jalapeño, too! You can also make this sauce with other citrus fruits, I chose to use oranges because they are local to where I live in Florida.
What Is Tuna Sashimi?
Tuna sashimi is a traditional Japanese dish consisting of thinly sliced raw tuna served without rice, allowing the natural flavor and texture of the fish to take center stage. It is typically made with high-quality, sushi-grade cuts such as bluefin, yellowfin, or blackfin tuna, prized for their rich taste and buttery consistency. The slices are carefully cut against the grain using a sharp knife to create a smooth, clean bite, and are often arranged simply to highlight the fish’s freshness and color.
Sashimi is usually served with minimal accompaniments like soy sauce, wasabi, pickled ginger, or citrus-based sauces such as ponzu. Unlike sushi, which includes seasoned rice, sashimi focuses entirely on the fish itself, making quality and proper handling essential for both flavor and safety. When prepared correctly, tuna sashimi offers a delicate, melt-in-your-mouth experience that is both light and deeply satisfying.
What Is Ponzu Sauce?
Ponzu sauce is a light, citrus-based Japanese condiment known for its bright, tangy flavor and subtle umami depth. It is typically made by combining soy sauce with citrus juice—most commonly yuzu, lemon, or lime—along with ingredients like rice vinegar, mirin, and sometimes kombu (seaweed) or bonito flakes to enhance its savory profile. The result is a balanced sauce that is both salty and refreshing, often used to complement delicate dishes without overpowering them.
Ponzu is commonly served as a dipping sauce for sashimi, dumplings, and hot pot, or drizzled over grilled meats, seafood, and vegetables. Its acidity helps cut through rich or fatty foods, making it especially popular with dishes like tuna sashimi. The sauce adds a clean, zesty finish that enhances the natural flavors of the ingredients while providing a subtle complexity that sets it apart from standard soy sauce. For this Blackfin tuna sashimi recipe, we’ll be serving the fish with the sauce and a slice of jalapeño.
Frequently Asked Questions
The Catch: How I Got This Blackfin Tuna
I made this recipe from the same Blackfin Tuna I used in my Blackfin Tuna Poke recipe. I had originally gone out spearfishing on my kayak and ended up shooting a Yellow Jack, then my buddy showed up on his Jet Ski and I paddled out a little deeper to do some jigging for Tuna.
I was definitely a little rusty because it had been awhile since I had done any jigging, but as soon as I got that first hit, the adrenaline starting pumping. I didn’t have a gaff or really anything fishing related on my kayak, other than the rod and reel my buddy let me borrow. When I got the fish close to the kayak, I had to just flip him over the side. Luckily he was the perfect size to do that.
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