This is a great quick preparation for skirt steak or flank steak. Don't be afraid to char it and then slice it thin to serve. Instead of discarding the marinade or reducing the amount, bring it to a boil on the stovetop while you grill the steak and reduce it by half for an amazing glaze.
made this with skirt steak - delicious quick and easy. Cut the balsamic in half, that was plenty. cooking on high heat may be too high. careful not to burn the outside. my grill is super-hot so had to lower the flame.