Seared Ahi Tuna Recipe (Sesame-Crusted, Rare in 10 Minutes)

Seared ahi tuna is the fastest impressive dinner I know. Two minutes in a hot pan, a few minutes to slice, and you have a plate that looks like it came from a good restaurant: a thin golden crust of sesame seeds around a center that is still ruby red and cool.

The whole thing hinges on buying the right fish and not overcooking it. Ahi tuna is meant to be served rare; cooked through, it turns gray, dry and tastes like canned tuna. So buy sushi-grade tuna from a fishmonger you trust, get the pan as hot as it will go, and count the seconds.

A quick soy-ginger marinade seasons the outside, and the same flavors make a dipping sauce. Serve it over rice, on a salad, or with roasted potatoes and edamame as in the photo.

Why this recipe works

• A very hot pan sears the outside in under a minute, so the center never has time to cook past rare.
• Thick steaks, at least an inch, are essential; thin ones cook through before they brown.
• Patting the marinated tuna dry lets the sesame seeds stick and the crust form instead of steaming.
• Slicing against the grain into thin pieces makes the tuna tender and shows off the pink center.

What is sushi-grade tuna, and where to buy it

Sushi-grade or sashimi-grade is not a regulated term, but it signals that the seller considers the fish safe to eat raw, usually because it was flash-frozen at sea to kill parasites. Buy from a reputable fish counter, a Japanese market, or a good online fish seller, and ask specifically for tuna you can serve rare. Look for deep red or pink flesh with a translucent sheen and no brown edges or fishy smell.

Frozen sushi-grade ahi is often better than the fresh tuna at a supermarket, since it was frozen within hours of being caught. Thaw it overnight in the refrigerator, still wrapped, and use it the same day.

How long to sear ahi tuna

For a 1-inch steak in a smoking-hot pan, 45 to 60 seconds per side gives a rare center with about a 1/4-inch cooked band on each side. For medium-rare, go 90 seconds per side. Past that, the tuna loses what makes it special. A 1 1/2-inch steak can take 60 to 75 seconds per side and still be rare. Do not be tempted to sear the edges for long; a quick 10-second roll on each edge is plenty.

Ginger-soy dipping sauce

Whisk together 3 tablespoons soy sauce, 1 tablespoon rice vinegar, 1 teaspoon toasted sesame oil, 1 teaspoon honey, 1 teaspoon grated fresh ginger and 1 sliced scallion. Serve alongside the sliced tuna, or spoon it over. A dab of wasabi or a spoonful of chili crisp turns it up.

How to serve seared tuna

• Over steamed rice with avocado, cucumber and the dipping sauce, poke-bowl style.
• On a salad of mixed greens, mango and sesame vinaigrette.
• With roasted baby potatoes and edamame for a simple plated dinner.
• Sliced thin as an appetizer with pickled ginger and wasabi.

How to store ahi tuna

• Seared tuna is best eaten immediately. Leftovers keep, tightly wrapped, in the refrigerator for 1 day and are good cold on a salad.
• Do not reheat; it will cook through and turn dry.
• Raw tuna should be cooked the day it is bought or thawed.

Variations to try

• Blackened ahi: skip the sesame seeds and coat the tuna in 2 tablespoons Cajun or blackening seasoning before searing.
• Peppercorn crusted: use coarsely cracked black pepper instead of sesame seeds.
• Ahi tuna poke bowl: cube the seared tuna and serve over rice with avocado, cucumber, edamame, and the dipping sauce mixed with a spoonful of mayonnaise and sriracha.
• Grilled: brush the marinated steaks with oil and grill over very high heat for 1 minute per side.

Frequently asked questions

Is it safe to eat seared ahi tuna rare?

Yes, if it is sushi-grade tuna from a reputable source that has been handled and kept cold properly. Commercially frozen tuna has been treated to kill parasites. If you are pregnant or immunocompromised, cook the tuna through instead, or choose another fish.

How long do you sear ahi tuna?

About 45 to 60 seconds per side in a smoking-hot pan for a 1-inch steak with a rare center. Ninety seconds per side gives medium-rare. Longer than that and the tuna becomes dry and gray.

Why won't my sesame seeds stick?

The tuna was too wet. Pat it dry after marinating, then press it firmly into the seeds. A thin film of the marinade left on the surface is enough to hold them.

Can I use frozen tuna steaks?

Yes, and they are often the best choice. Thaw them overnight in the refrigerator, never at room temperature or in the microwave, and pat them very dry before cooking.

What does ahi tuna taste like?

Mild, clean and meaty, with a texture closer to a rare steak than to flaky fish. It is not fishy when fresh. The sesame crust and soy marinade add savory, nutty flavor to the outside while the center stays delicate.