Whisk together the marinade ingredients in a bowl: soy sauce, sesame oil, grated ginger, and chopped green onions. Mix until well combined.

Marinate the tuna by placing the steaks in a shallow dish and pouring the marinade over them. Cover and refrigerate for 20 minutes.

Preheat your skillet over medium-high heat and add a splash of oil to prevent sticking.

Sear the tuna steaks for about 1-2 minutes on each side until golden brown, keeping the center pink and tender.

Rest the steaks for a minute after cooking to allow juices to redistribute.

Slice against the grain into thin strips.

Garnish with toasted sesame seeds and extra green onions.