Tuna With Black Pepper, Artichokes, and Lemon
---------------------------------------------
2 tablespoons  olive oil
1/2 red onion, thinly sliced
3 6.5-ounce jars artichoke hearts, drained and halved
1 lemon, cut into 8 slices
2 cloves garlic, thinly sliced
4 sprigs fresh thyme (optional)
1 1/2 pounds  fresh tuna, cut into 1-inch cubes
1 1/2 teaspoons  kosher salt
1 teaspoon  black pepper

Heat 1 tablespoon of the oil in a large skillet over medium heat. Add the 
onion and cook until softened, about 3 minutes.

Add the artichoke hearts, lemon, garlic, and thyme (if desired). Cook until
heated through, 3 more minutes. Transfer to a plate.

Season the tuna with the salt and pepper. Heat the remaining oil in the 
skillet.

Cook the tuna, turning to brown all sides, to desired doneness, about 2 
minutes for medium.

Return the artichoke mixture to the skillet and toss.

From: RealSimple