Using a bowl, add garlic, olive oil, lime juice, cilantro, salt and pepper. Whisk it together. Add the tuna steaks and marinate them for 15 minutes.
In another bowl, combine all ingredients for the salsa. Season with salt & pepper. Reserve.
Heat the grill to medium high. Remove tuna steaks from the marinade and add them to the hot grill.
Grill them for 1-2 minutes each side. Remove from grill and serve.
Arrange the tuna steaks on the plate, add spoons of salsa, either on the side or on top.
Sprinkle a little cilantro and enjoy!