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.
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Nutrition information per serving: 90 Calories; 54 kcal Calories from fat; 6 g Total Fat; 0.5 g Saturated Fat; 0 g Trans Fat; 0 g Monounsaturated Fat; 0 mg Cholesterol; 650 mg Sodium; 3 g Total Carbohydrate; 0 g Dietary Fiber; 0 g Protein; 0 mg Iron; 0 mg NE Niacin; 0 mg Vitamin B6; 0 mcg Vitamin B12; 0 mg Zinc; 0 mcg Selenium; 0 mg Choline;