Grilled Flank Steak- My Favorite Balsamic Marinade

Mix all ingredients together in a ziploc or a large dish.1/2 cup soy sauce,1/3 cup vegetable oil,2 tablespoons dark brown sugar,1/4 cup Worcestershire sauce,1 teaspoon dijon mustard,4 cloves garlic,2 tablespoons chives,1 1/2 teaspoons ground black pepper,2 teaspoons balsamic vinegarAdd the flank steak and marinate (covered) in the fridge overnight or at least all day.2 lbs flank steakHeat the gas grill to high heat. Remove the steak from the marinade and lay on the grill for 2 minutes per side. Then turn down to medium and cook another 7-10 minutes, flipping halfway again, or until an internal temperature of 130 degrees F (using a meat thermometer) for medium rare, or longer for medium etc. Remove and set aside to rest on a cutting board with foil draped over the top.Meanwhile, place 1/2 of the remaining marinade in a sauce pan over medium heat.Bring the marinade to a simmer for 10 minutes, set aside.Slice the steak against the grain and serve with a drizzle of additional sauce if desired.