In small bowl, combine all of the marinade ingredients and whisk together. Pour into a large zip baggie. Add the steak to the marinade and refrigerate overnight. Turn the bag occasionally to coat well.
Grill the steak 4 to 6-inches above hot coals or on gas grill rack, 5 to 7 minutes per side.
Notes
*If you are preparing this recipe as GLUTEN-FREE, just be sure to use brands of Worcestershire sauce and mustard that are known to be GF.
WW Points were calculated with the steak absorbing about half of the marinade.