Heat 3/4 cup of the broth to boiling in 10-inch nonstick skillet over medium-high heat. Stir in onion, celery, cabbage, mushrooms, gingerroot, and garlic. Cook 5 to 8 minutes, stirring frequently and adding more broth if vegetables begin to stick, until vegetables are tender; remove from heat. Stir in soy sauce and sesame oil. Remove vegetable mixture from skillet. Wipe out skillet.