In a large bowl, whisk together soy sauce, balsamic vinegar, Worcestershire sauce, brown sugar, finely diced onion, minced garlic, and parsley.
¼ cup Soy Sauce, 2 Tablespoon Balsamic Vinegar, 3 Tablespoon Worcestershire Sauce, 3 Tablespoon Brown Sugar, 3 Tablespoon Finely Diced Onion, 3 cloves Minced Garlic, 2 Tablespoon Fresh Parsley