01 - In a medium mixing bowl, whisk together soy sauce, olive oil, Worcestershire sauce, balsamic vinegar, and lemon juice until evenly blended.
02 - Add minced garlic, Dijon mustard, brown sugar, black pepper, rosemary, and onion powder to the bowl. Whisk again until the marinade is thoroughly combined.
03 - Arrange steaks in a large resealable plastic bag or shallow dish. Pour the marinade over the steaks, ensuring each piece is well coated.
04 - Seal the bag or cover the dish and refrigerate for at least 2 hours or up to 24 hours. Turn the steaks periodically to maximize flavor absorption.
05 - Remove steaks from the marinade, gently pat dry, and discard the used marinade. Cook steaks to preferred doneness by grilling, broiling, or pan-searing.