Olive oil and butter
Crushed black pepper
2-4 garlic cloves, cut in half
1 tbsp minced shallots
1-2 tbsp unsalted butter
At least an hour before you are to cook your meat, pat it dry, add salt and pepper, and let sit out to bring it up to room temperature.
Cover the bottom of the skillet with oil and heat on the stove at high heat until the pan starts to smoke. Add the steak to the pan, and let sear until you get a nice medium/dark brown crust. Flip the steak, and sear the other side. Turn down the stove to medium heat.
Turn the burner to lowest setting, add the 2 T., parsley, garlic, and shallots to the pan, and cover the skillet. In about 2 minutes, stir the sauce you have made and spoon it over the meat. Remove from burner and leave covered for another 5 minutes.
When you plate the steak, dress it with the au jus, butter, shallots, garlic, and parsley from the pan.