Ahi Tuna is a restaurant favorite that's easier to make at home than you think! It's quick and healthy - great for something a little different on a weeknight.
Add the sauce ingredients to a small bowl and mix together. Give it a taste and adjust ingredients if needed. Set aside.
Season both sides of the tuna steaks with salt & pepper.
Add the oil to a skillet over medium-high heat (or even hotter) and let the pan get very hot (oil should be smoking a bit). Sear the tuna for 45 sec - 1 minute per side.
Slice the tuna and serve it with the sauce, sesame seeds sprinkled over top, and chopped scallions.
Notes
My ahi tuna steaks were about 1" thick and I cooked them for 1 minute/side.
Be sure to use sushi-grade ahi tuna for taste and food safety reasons.
I like to keep fresh ginger in the freezer because it's easier to grate, and I always have some on-hand that way.