Place the balsamic vinegar, olive oil, garlic and pepper flakes in a 1-gallon resealable plastic storage bag and add the rib-eyes. Allow to marinate at room temperature for up to 2 hours.
Preheat a grill to medium heat.
Remove the steaks from the marinade
and season on both sides with the Essence and salt. Place the steaks on the grill
and cook for 6 minutes on the first side, turning a quarter turn once after 3 minutes to make a crosshatch pattern. Turn the steak over and brush with 3 tablespoons of the barbecue sauce and continue to cook for an additional 5 to 6 minutes for medium rare. Remove from the grill and serve immediately.