This flank steak marinade is a sweet and savory blend of olive oil, garlic, soy sauce, brown sugar and spices. It produces tender and juicy marinated flank steak every time!
Combine the soy sauce, olive oil, brown sugar, cider vinegar, Worcestershire sauce, mustard and pepper in a resealable bag; seal and shake to combine.
Reserve 2 tablespoons of the marinade for later use. Stir the garlic into the bag of marinade.
Add the steak and marinate for 2-24 hours.
Heat an outdoor grill or stove top grill pan to medium-high. Place the steak on the grill and cook for 5-6 minutes per side, depending on the thickness of your meat and the desired level of doneness.
Remove the meat from grill and cover with foil. Let stand for 5-10 minutes and then slice thinly against the grain with a very sharp knife. Drizzle with reserved marinade, then serve.