Beef Sirloin with Onions

1. 1 lb sirloin steak, trimmed of fat, cut into 1-inch cubes
2. 2 Tbsp lite soy sauce, divided
3. 1 Tbsp Worcestershire sauce
4. 1/4 tsp black pepper
5. 1 (4 oz) yellow onion, cut in eighths

In a gallon-size zippered plastic bag, combine beef and 1 Tbsp soy sauce, seal tightly, shake to blend, and let stand at room temp for 15 minutes. In a small bowl, combine remaining soy sauce, Worcestershire sauce, and pepper and set aside. Heat a 12-inch nonstick skillet over high heat. Add beef and cook 1-1/2 minutess or until browned on edges, stirring constantly. Remove beef from skillet and set aside on separate plate. Reduce heat to medium high and add onions to pan drippings. Cook 4 minutess or until just tender-crisp. The layers will separate while cooking. Increase heat to high, add beef and soy mixture to onions, and cook 30 seconds or until richly glazed, stirring constantly (liquid will evaporate). Serve immediately.