1. Combine first 4 ingredients in a medium saucepan; bring to a boil. Add barley; cover, reduce heat, and simmer 10 minutes. Remove from heat; let stand 5 minutes.
2. Coat a nonstick skillet with cooking spray; place over medium-high heat until hot. Add mushrooms, onion, and celery; cook 3 minutes or until tender, stirring often. Stir into cooked barley.
carbo rating: 18