Seared Ahi tuna is yellowfin tuna that is crusted in sesame seeds. Then it's quickly cooked quickly, leaving the outside crusted and the inside rare. It's often sliced thin and served with sauces like soy or wasabi mayo.
In a large zip-lock bag, add the soy sauce, sesame oil, and brown sugar. Massage the bottom of the bag to incorporate all the ingredients together. Add in the tuna steaks and place in the refrigerator for 1 hour to marinate.
Add the black and white sesame seeds in a shallow dish. Dip your tuna steaks into the sesame seeds, making sure to coat all sides.
Heat your oil in a large skillet over medium-high heat. Add the tuna to the pan and sear both sides until golden brown, about 1-2 minutes per side.
Slice your tuna and serve it with some rice and soy sauce.
Notes
Use a well-seasoned cast iron skillet or quality nonstick pan for the best sear and color on your tuna.
Make sure your pan is fully heated before adding the tuna to prevent sticking. You can test the heat by flicking a few drops of water into the pan. If the water forms balls and moves around, the pan is ready.
An outdoor griddle can be used for searing as long as you follow the same cooking instructions.
Ahi tuna is typically served with a pink center, which means it is medium rare. If you need to cook it through for health reasons, consider adding a sauce to keep it from drying out.
You can marinate the tuna for longer than an hour to deepen the flavor. Just avoid acidic ingredients like citrus or vinegar, which can change the texture by partially cooking the fish.