Marinate the meat with the olive oil, balsamic vinegar, garlic and rosemary for ideally 3 hours. Less time will result in less vinegar taste to the meat. If you’re pressed for time still marinate for at least 30min.

Once marinating is done heat the BBQ on high. While the BBQ is warming, put the meat on a baking sheet flat and apply kosher salt and pepper liberally to one side. Once the BBQ is hot throw on the meat with the salted side down. While the meat is searing add more salt and pepper to the other side of the meat while on the grill. Allow the meat to sear on one side for about 3 minutes. Flip meat and cook for another 3 minutes. This will be about medium rare. Adjust time accordingly to your desired doneness.