Step 1

For the marinade, mix all the ingredients together in a bowl. Place the steaks in a shallow dish, pour marinade over to coat the meat completely. Cover, chill and leave to marinate overnight.

Step 2

Scrape the marinade off the steaks and rub each steak with a drop of sunflower oil. Heat a griddle pan until very hot, then rub the steaks with the reserved lemon half and cook with the rosemary sprig for 3-4 mins each side for medium-rare, 1 min longer if you prefer it cooked more. Rest for 5 mins before serving with mash or chips.