Add the oil to the cast iron skillet, and heat it up at the highest temperature that you can for 5 minutes.After 5 minutes, add the steak to the cast iron skillet.
Cook the steak for 3 minutes. Flip the steak over, and cook for one minute.After that, cook each side for 30 seconds, which will be a total of 2 minutes.
Once those sides are done, put the steak back on the side that was only cooked for 1 minute. Add the unsalted butter, rosemary, thyme, garlic, and red crushed pepper flake to the cast iron skillet.
The steak will now cook for 2 minutes. During that 2 minutes, baste the steak frequently. When I baste my steaks, I keep going until the 2 minutes are up.