Whisk together all ingredients except for the steaks.
Pour marinade into the bottom of a large resealable container, or divided between two containers large enough to hold each steak.
Add steaks. Coat bottoms well then flip and coat other sides.
Cover and refrigerate for 1 hour, flipping the steaks every 15 minutes.
Cook as you normally would. Note that since the marinade contains molasses and brown sugar the steaks will char if left over high heat for very long. Sear your steaks over high heat then finish them over indirect heat to prevent burning.