01 -
Grab a mixing bowl and whisk together soy sauce, vegetable oil, Dijon mustard, Worcestershire sauce, lemon juice, red wine vinegar, minced garlic, and black pepper. Make sure it's all combined well.
02 -
Put the flank steak in a 22 x 33 cm glass dish. Pour the marinade over it, flipping the steak a few times to cover it evenly. Wrap it up in plastic and chill for at least 2 hours or up to 12 for the best flavor.
03 -
Set your outdoor grill to medium-high. Lightly oil the grates so the steak doesn't stick.
04 -
Take the steak out of the dish, letting any extra marinade drip off, then throw out the leftover marinade.
05 -
Put the marinated steak on the hot grill. Cook each side for about 5 minutes, or until it's done the way you like it.
06 -
Move the steak to a cutting board and let it sit for 5 minutes. This keeps the juices in. Slice it thinly, cutting against the grain, and serve right away.