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Mix the balsamic vinegar, oil, honey, Worcestershire, Dijon mustard, garlic, salt, and pepper in a small bowl
Place the flank steak and marinade ingredients in the slow cooker and flip the steak once or twice to coat the steak.
Cook undisturbed for 6 hours on low or 3-4 hours on high until very tender.
Carefully transfer the steak to a cutting board, let it rest for 10 minutes, then slice it against the grain and serve.