Rub the meat with the garlic and place on a plate.
Pour over the whisky and, depending on the quality of the meat, marinate it for 20-120 minutes or overnight.
Mash the cheese with a fork, then mix with the yoghurt and half of the chives. Set aside.
Heat a griddle pan or barbecue.
Season the meat, then cook the steak on both sides to your liking. 2-3 minutes per side will leave it medium - a little pink in the middle.
Rest for a couple of minutes before serving.
Serve with the cheese sauce & salad or greens and sprinkle with the remaining chives.