How to Make It
In a food processor (or by hand), finely chop the parsley, garlic, and oregano. Transfer to a bowl. Add the oil, vinegar, salt, and pepper. Mix well.
Heat broiler. Cut the steak into 4 portions. Place in a roasting pan or on a baking sheet in a single layer and rub both sides with the sauce.
Broil steak, 3 to 4 minutes per side for medium. Remove and let rest, covered, for 5 minutes before serving.
Serve steaks with raw onion rings.