Tuna Crudo
Tuna crudo is an Italian-style raw fish preparation: sushi-grade tuna sliced thin, arranged on a chilled plate, and dressed simply with good olive oil, citrus juice, and salt, sometimes with chile flakes or herbs. Unlike sashimi, which is served plain with soy sauce and wasabi on the side, crudo is dressed before it reaches the table, so the seasoning has to be balanced carefully since there's no adjusting it afterward.
Varieties
Bluefin tuna has the deepest color and highest fat content, prized for crudo but expensive and often subject to sustainability concerns. Yellowfin (often labeled ahi) is leaner and more widely available at a lower price. Bigeye falls between the two in fat content. Skipjack, the tuna most often canned, is too soft and mild in flavor to hold up well raw.
Buying tips
Ask specifically for tuna labeled sushi-grade or sashimi-grade, and ask whether it's been previously frozen, since that step is what makes it safe to eat raw. Fresh tuna should look deep red or maroon, feel firm and slightly springy, and smell like clean ocean water rather than fishy or ammonia-like. Avoid pieces with browning edges or a dull, grayish cast.
Substitutes
Yellowfin tuna (ahi) — 1:1 by weight
The most common substitute for bluefin in crudo; leaner and slightly more mild, with a similar deep red color when fresh.
Hamachi (yellowtail) — 1:1 by weight
Buttery and higher in fat than tuna, with a milder, less iron-forward flavor. A common swap at Japanese-Italian fusion restaurants.
Wild salmon — 1:1 by weight
Noticeably fattier and softer in texture than tuna; needs a firmer hand with acid in the dressing to cut the richness.
Red snapper or fluke — 1:1 by weight
Much leaner and firmer than tuna, closer to the texture of classic Peruvian-style crudo or ceviche than the Italian version.
Octopus, blanched and chilled — 1:1 by weight
Not raw, so it isn't technically crudo, but used the same way when raw fish isn't available; needs a very short blanch to stay tender.
Storage
Buy tuna for crudo the day it will be served. Keep it on ice in the coldest part of the refrigerator, well below 40°F, and slice it just before serving. If the tuna hasn't already been previously frozen by the supplier (most sushi-grade tuna has, per FDA guidance to kill parasites), freeze it at -4°F or colder for at least seven days before eating it raw.
How to use
Slice tuna against the grain into pieces about 1/8 inch thick, using a sharp, thin-bladed knife in one smooth pull rather than sawing. Arrange on a chilled plate, then dress immediately before serving with olive oil, a squeeze of citrus, flaky salt, and any additions like chile or herbs. Crudo is meant to be eaten within minutes of dressing since the acid and salt begin to lightly cure the surface of the fish.
What it pairs with
Good olive oil and fresh citrus (lemon, lime, or yuzu) are the backbone of the dressing. Thin slices of radish, cucumber, or avocado add crunch and creaminess, while a small amount of finely sliced chile, capers, or fresh herbs like chives or basil round it out without overwhelming the fish.
Nutrition
A 4-ounce portion of raw tuna is high in protein (around 27 grams) and low in carbohydrates, with a modest amount of omega-3 fat. Larger species like bluefin and bigeye carry more mercury than smaller tuna, so pregnant women and young children are generally advised to limit portions or choose skipjack instead.
FAQ
Is tuna crudo the same as tuna sashimi?
No. Sashimi is sliced plain and served with soy sauce and wasabi on the side for dipping. Crudo is dressed with olive oil, citrus, and salt before it's served, so the fish arrives already seasoned.
Is it safe to make tuna crudo at home?
Yes, as long as the tuna is labeled sushi-grade or sashimi-grade and has been previously frozen to kill parasites, which most commercially sold sushi-grade tuna already has been. Keep it cold and slice it just before eating.
Can you use frozen tuna for crudo?
Yes, and it's actually recommended: properly frozen tuna (at -4°F or colder for at least seven days) is safer to eat raw than fresh, never-frozen tuna, since freezing kills parasites that cooking would otherwise handle.
Why does crudo taste different from the same tuna cooked seared?
Raw tuna has a cleaner, more mineral, almost buttery flavor that gets muted once heat firms up the proteins and browns the surface. Dressing it raw with acid and oil highlights that delicate flavor instead of masking it with a sear.
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