Sesame-Crusted Seared Ahi Tuna Steak

0 Combine the soy sauce, sesame oil, ginger, half of the salt, and half of the black pepper in a shallow dish.
1 Add the tuna steak and turn to coat it completely. Allow it to marinate for 10 minutes.
2 Combine the black sesame seeds, white sesame seeds, brown sugar, remaining salt, and remaining pepper on a plate.
3 Remove the tuna from the marinade and let the excess liquid drip away. Press the steak into the sesame mixture, coating the top, bottom, and sides.
4 Heat a heavy skillet over medium-high to high heat until piping hot. Add the olive oil and swirl to coat the pan.
5 Gently place the tuna in the pan and sear without moving it for 60 to 90 seconds.
6 Flip and cook the second side for another 60 to 90 seconds, watching for evenly sized cooked bands along both sides of the tuna.
7 Transfer the tuna to a cutting board and rest for 1 to 2 minutes.
8 Slice against the grain with a sharp knife. Serve immediately, either on its own or with rice, cucumber, and avocado.