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Marinade: In a small bowl mix olive oil OLD BAY lime juice and cilantro. Place tuna in large resealable plastic bag and add marinade. Turn to coat well.
Marinate in fridge 15 minutes (longer for extra flavor).
Transfer to grill and discard leftover marinade. Grill over medium heat 5 to 6 minutes per side or until desired doneness. (Tuna is more moist when its center is still rosy-pink after cooking.)