First, if you have time take the the steak out of the fridge and let it get as near to room temperature as you have time for. In a pinch you could go at it right out of the fridge. Put a pan on at medium high. Trim a piece of fat off the steak, put it in the pan and smear it around to coat the pan with the melted fat. Sprinkle a little salt and pepper on one side of the steak and press it down with the side of a knife. Repeat on the other side. Put it in the pan and just sear each side about 1-1/2 minutes a side.