#1 In a medium bowl or zip-top bag, combine soy sauce, olive oil, balsamic vinegar, Worcestershire sauce, garlic, rosemary, pepper, mustard, brown sugar, and red pepper flakes. Whisk or shake to combine #2 Add steak to the marinade, ensuring it’s fully coated. Seal and refrigerate. Marinate for at least 1 hour, ideally 4–8 hours #3 Remove steak from marinade and let it come to room temperature. Pat dry with paper towels for better searing #4 Cook to desired temperature on grill or skillet. Rest steak for 5 minutes before slicing. Serve and enjoy!