11. In a large resealable plastic storage bag, combine all ingredients except the beef and cornstarch. Add beef, seal, and refrigerate at least 8 hours or overnight, turning occasionally.
22. Remove beef from marinade and place in a large skillet. Add cornstarch to marinade; mix well and set aside. Brown beef over medium-high heat 5 minutes per side. Reduce heat to medium-low, add marinade mixture, cover, and cook 30 minutes. Uncover and cook another 30 to 40 minutes, or until desired doneness.
33. Thinly slice meat across the grain and serve with pan juices.