Brown ground beef in large skillet over medium-high heat for 5 to 7 minutes or until thoroughly cooked, stirring frequently. Drain.
Add celery, bean sprouts, water chestnuts, mushrooms, broth, piementos, soy sauce and ginger; mix well. Reduce heat; cover and simmer 15 minutes, stirring occasionally.
Meanwhile, in small bowl, blend cornstarch and water until smooth.
Stir cornstarch mixture into beef mixture. Cook until mixture is bubbly and slightly thickened. Serve over chow mein noodles. If desired, serve with additional soy sauce.