Since tuna is so lean, it can be dry and tough when fully cooked. You'll want to leave the center slightly pink. Start testing the tuna for doneness after a few minutes on the grill.

Tuna Steaks with Grilled Veggies

Combine 5 tbsp. oil, lemon juice, seasoned salt and garlic paste in a medium bowl for marinade. Reserve one-third of the marinade in a small bowl; set aside. Place remaining marinade in a large resealable bag placed in a shallow dish. Add tuna. Seal bag and turn to coat. Marinate in the refrigerator for 15 minutes, turning once.

Toss together precut vegetables, lemon halves and remaining 3 tbsp. oil in a medium bowl. 

Heat a large grill pan over medium-high heat. Remove tuna steaks from bag; discard marinade. Cook tuna in grill pan for 5 minutes. Turn steaks. Add vegetable mixture to grill pan; cook with tuna for 5 to 7 minutes more or until desired doneness. 

Drizzle cooked tuna steaks with reserved marinade. Serve steaks with vegetables and lemon halves.