1Combine soy sauce and sesame oil in a shallow dish. Fully coat ahi tuna steaks on all sides and let sit at room temperature for 10 minutes.
2Combine sesame seeds, brown sugar, garlic powder, onion powder, and salt on a plate. Place ahi tuna on the mixture and press firmly to coat all sides.
3Heat a skillet over medium heat. Add oil and ahi tuna steaks once the pan is blazing hot. Cook undisturbed for 45-60 seconds per side until seared.
4Slice the ahi tuna and garnish with green onions and smoked sea salt.