Information for this recipe is approximate and derived by calculations based upon supplier information and available reference data. These values may change based on your final product, substitution and or addition of ingredients, or use of a particular cooking technique.
Preheat grill to medium. For marinade, combine balsamic vinaigrette and mustard in small bowl. Remove and reserve 2 tablespoons. Place steaks and remaining marinade in resealable plastic bag. Refrigerate 20 minutes. Drain beef, discarding marinade.
Grill steaks, covered and turning once, 12 to 14 minutes for medium rare doneness (internal temp 150°F). (Do not overcook.)