What you need:
1/4 cup Balsamic Vinegar
a few dashes of Worcestershire sauce
a clove of garlic, smashed,
1 Tbsp Italian Seasoning
2 Tsp brown Sugar
Add everything into a ziploc bag except for the London Broil. Squish it around to mix the ingredients. Place London Broil into the bag and make sure the marinade is evenly distributed. Lay flat on a plate and marinate in the fridge for at least 4 hours, turning every once in a while.
Before cooking on the grill, remove the London Broil from the marinade and let rest for at least 30 minutes.
I promise, you will not be disappointed by this marinade! So good!