Heat a large frying pan over a high heat until it is really hot.
Rub both sides of the steak with a little oil and season with salt and black pepper.
Place the steak in the hot pan and fry for 4 minutes. Then turn the steak over and fry for a further 3 minutes. Remove from the pan and allow to rest on a carving board.
Take the pan off the heat and add in the remaining olive oil, garlic and rosemary sprigs.
Cut some strips of peel off the lemon and add these to the pan. Allow to infuse for a couple of minutes while the meat is resting, then add in the juice of the lemon. Stir to release any bits stuck to the bottom of the pan.
Slice the steaks thinly with a sharp knife. Season with salt and black pepper. Spoon over half the dressing. Mix the rocket leaves and cheese with the remaining dressing. Delicious served with sautéed potatoes.