Bring vinegar to a boil in a small saucepan. Reduce heat; simmer over medium heat about 15 minutes or until reduced to 1/4 cup. Mix butter and flour in small bowl until smooth. Stir broth and pepper into vinegar. Gradually whisk in butter mixture until sauce is smooth; bring to a boil. Reduce heat; simmer 3 minutes, stirring constantly. Serve immediately.
Nutrition information per serving: 68.7 Calories; 41.4 Calories from fat; 4.6g Total Fat (2.9 g Saturated Fat; 1.2 g Monounsaturated Fat;) 12.7 mg Cholesterol; 50.5 mg Sodium; 5.3 g Total Carbohydrate; 0 g Dietary Fiber; 0.5 g Protein; 0.2 mg Iron; 0.1 mg NE Niacin; 0 mg Vitamin B6; 0 mcg Vitamin B12; 0 mg Zinc; 0.4 mcg Selenium; 1.2 mg Choline.