Heat cast iron pan over high heat and add the vegetable oil. Make sure the pan is HOT! The oil should smoke a bit to indicate this. Add the steak and throw in the butter, garlic, thyme and rosemary. Once the butter melts fully (it won't take long), flip the steak. Tilt the pan away from you until the butter pools a bit at the bottom of the pan, take a spoon and baste the steak with the butter/garlic mixture. Again, this part is not a long process so no more than a minute per side.