Do I need “sushi-grade” tuna for this?
If you plan to keep the center rare, buy the best-quality tuna you can from a trusted fish counter. “Sushi-grade” is not a regulated term in the US, so ask for tuna that is suitable to serve rare and has been handled and stored properly. When in doubt, cook it longer.
Food safety note: Serving fish rare carries some risk. If you are pregnant, immunocompromised, or serving young kids or older adults, consider cooking the tuna through.
What should I look for when buying ahi tuna?
Go for center-cut steaks with a clean, mild ocean smell (not fishy). Color can vary by species and handling, but you want it to look fresh, not dull or dried out. Previously frozen tuna is common and totally fine. Buy from a place you trust.
How do I keep the tuna from sticking?
Two things: make sure your pan is hot, and make sure the tuna is dry before it hits the oil. Pat it well with paper towels. Also, do not move it too soon. Let the crust form, then it will release.
What internal temperature should I aim for?
For rare to medium-rare ahi, aim for about 115°F to 125°F in the center. Keep in mind FDA-style food safety guidance for fish is higher than that. If you want it fully cooked, keep going until it flakes and the center is no longer translucent.
Can I cook this without sesame oil?
Yep. Swap in olive oil for the sauce and add a pinch of toasted sesame seeds for that nutty vibe, or skip it entirely and lean on citrus and soy.
Can I use bottled citrus juice?
Fresh is better here because it tastes brighter and the zest adds a lot. But if bottled is what you have, use it and add a little extra zest if you can.