Sesame seeds make a perfect crust for tender ahi tuna steaks. Sear just long enough to get a nice crust on the fish. Serve with baby bok choy, rice, and dipping sauce to complete this sushi-inspired meal.
Mix soy sauce, sesame oil, and some black pepper together in a small bowl. Rub all over both sides of tuna steaks.
Steam bok choy. Place baby bok choy in a pot with 1 inch of water. Steam over high heat for 5-7 minutes.
Meanwhile, mix white and black sesame seeds together and spread out on a plate. Dip tuna steaks to coat both sides with sesame seeds.
Heat oil in a skillet over medium-high heat. Sear tuna for 1 minute per side. Remove to a cutting board and let rest 5 minutes before serving. (During this time, you can make the dipping sauce.)
Serve tuna steaks with steamed baby bok choy, rice, and dipping sauce. Garnish with scallions.