In a bowl, whisk together soy sauce, olive oil, red wine vinegar, minced garlic, black pepper, onion powder, dried thyme, and Worcestershire sauce to create the marinade.

Place the London broil in a resealable plastic bag or shallow dish and pour the marinade over the meat. Seal the bag or cover the dish and refrigerate for at least 1 hour, preferably overnight for maximum flavor.

Preheat your grill to medium-high heat.

Remove the London broil from the marinade and shake off any excess. Make shallow cuts on each side of the meat to help it cook better and let the marinade soak in.

Place the meat on the grill and cook for about 4-6 minutes on each side for medium-rare, or adjust the cooking time according to how well you like it cooked.

Once done, remove the London broil from the grill and let it rest for about 5-10 minutes before slicing.

Slice against the grain and serve with your favorite sides.