Mix soy sauce, honey, mustard paste, garlic, and ginger in a bowl.
This will be your marinade.
Place the tuna steaks in the bowl, ensuring they're coated.
Let them marinate for 30 minutes.
Heat olive oil in a skillet over medium-high heat.
Add green onions for a brief sauté.
Place the tuna steaks on the skillet.
Sear each side for no more than 45 seconds.
This method keeps the center raw.
Sprinkle bagel seasoning generously over the tuna to finish.
It adds a flavorful crunch.