2/3 cup balsamic vinaigrette
2 tablespoons Dijon-style mustard
Combine vinaigrette and mustard in small bowl. Place beef steak(s) and marinade in food-safe plastic bag; turn steak(s) to coat. Close bag securely and marinate in refrigerator 15 minutes to 2 hours for tender steaks; 6 hours or as long as overnight for less tender steaks, turning occasionally.
Remove steak(s) from bag; discard marinade. Place steak(s) on grid over medium, ash-covered coals or over medium heat on preheated gas grill. Grill according to the chart for medium rare (145°F) to medium (160°F) doneness, turning occasionally.
Visit our Marinades page for more information.