In a small bowl mix together the orange juice, marmalade, ginger, and oil. Place the tuna in a single layer on a shallow rimmed dish. Pour the marinade over the tuna and marinate for 30 minutes, flipping the tuna once.
Coat a broiling pan with nonstick spray. Place the tuna steaks on the broiling pan and place the marinade in a heavy medium saucepan.
Broil the steaks about 6 inches from the broiler for about 5 minutes on each side, or until cooked through.
Add the orange sections and scallions to the saucepan and bring to a boil.Boil for 2 minutes.