In a small bowl, combine teriyaki sauce, sugar, a dash of salt and pepper, sesame oil, ginger and vegetable oil. Place the tuna in a large resealable ziploc bag and pour the marinade. Gently coat the tuna with the marinade. Marinate for 15 minutes then thread onto metal skewers including the green onions.
Heat grill to high and cook tuna about 1 to 2 minutes per side. Serve
Recipe by Gluten-Free by Jan at https://glutenfreebyjan.com/gluten-free-teriyaki-tuna-kabobs/