01 -
In a small bowl, thoroughly whisk together balsamic vinegar, Worcestershire sauce, soy sauce, lemon juice, minced garlic, Dijon mustard, brown sugar, ground black pepper, and olive oil until evenly combined.
02 -
Place the flank steak into a large resealable plastic bag or shallow dish. Pour the marinade over the steak, ensuring full coverage. Seal the bag removing excess air or cover the dish tightly with plastic wrap. Refrigerate for a minimum of 1 hour and up to 12 hours for optimal flavor infusion.
03 -
Preheat the broiler to high heat and position the oven rack 15–18 cm from the heat source. Remove the steak from marinade; discard the marinade. Place the steak on a foil-lined baking sheet or in a baking dish. Broil for approximately 5–6 minutes, then flip and broil for an additional 4 minutes or until the desired internal temperature is reached. Rest the steak tented with foil for 5–10 minutes before slicing thinly against the grain.
04 -
Preheat the oven to 220°C. Heat olive oil in a cast iron skillet over medium-high heat. Remove steak from marinade and pat dry with paper towels. Sear the steak for 2 minutes on each side in the skillet. Transfer the skillet to the oven and cook for 5–6 minutes, adjusting time for preferred doneness. Allow the steak to rest, tented loosely with foil, for 5 minutes before slicing thinly across the grain.