Ensure the pan is VERY HOT before starting to cook.
Place the oiled steak into the hot pan and listen for the sizzle as it hits the hot surface and seals the juices.
Sear the first side for 2 minutes without touching the meat. Using tongs/spatula gently turn the steak over to cook the other side for a further 2 minutes.
Then reduce the heat and continue to cook depending on your preferred eat (see below).