Method:

• Whisk the vinegar, soy sauce, oil, sugar, garlic and mustard together. Add the rosemary and salt and pepper to
  taste.
• Put the steak into a zip lock bag and add the marinade. Push out the air and seal the bag. Marinade for at least 30
  minutes. Alternatively, place in a shallow dish and pour the marinade over. Turn over after 15 minutes.
• Braai over hot coals until the steak is done to your liking, basting every now and again with the marinade.
• Serve with rocket, Caprese salad and chips.