First thing, and this is a good rule for cooking all meat, set the steak out and let it come to room temperature.
Add kosher salt to a small bowl or ramekin. Add fresh cracked black pepper to a small bowl or ramekin. I do this because you'll be handling meat and it makes the process easier.
Brush each side of your steak pieces with vegetable oil.
Season each piece on all sides with the kosher salt and pepper.
Prepare your grill and heat on high.
Place steaks on the grill. For a piece this thick cook 3-4 minutes. Turn and let cook 3-4 minutes on the other side. Turn again on an angle, to get those lovely grill marks, for 2-3 minutes. Again for the other side. This is for medium to medium well. Adjust cooking times if you enjoy your steak more rare, or well done.
Remove steaks from grill. Add a slice of butter, REAL butter, to the top of each piece of steak. Cover the plate with foil and let meat rest for 5 minutes.