01 -
In a mixing bowl, combine vegetable oil, soy sauce, red wine vinegar, lemon juice, Worcestershire sauce, Dijon mustard, minced garlic, and ground black pepper. Whisk until thoroughly blended.
02 -
Arrange the flank steak in a 22 x 33-centimetre glass baking dish. Pour marinade over the steak, turning several times to ensure even coating. Cover with plastic wrap and refrigerate for 2 to 6 hours, or up to 12 hours for optimal flavour and tenderness.
03 -
Preheat an outdoor grill to medium-high heat. Lightly oil the grill grate to prevent sticking.
04 -
Take the steak out of the marinade, allowing excess liquid to drip off. Dispose of the used marinade.
05 -
Place the marinated flank steak on the preheated grill. Cook for approximately 5 minutes per side, or until preferred doneness is achieved.
06 -
Transfer steak to a cutting board and let it rest for 5 minutes to retain juices. Slice thinly against the grain and serve immediately.