Crush the garlic cloves well and mix them with the lemon juice and a tablespoon of olive oil in a container. Mix them very well until they have integrated and let it all rest for 10 or 15 minutes so the flavor intensifies.

Then, using a brush, spread this mixture on both sides of the tuna filets and season them with salt and pepper as you desire.

Heat up the griddle and with the temperature at medium-high, spread the rest of the oil over it. Once it’s hot place the tuna filets and cook them for 3 minutes. After this time, turn them over and cook for another 3 minutes.

Remove them from the griddle and serve with the finely cut fresh parsley spread over them.