In a large soup kettle or Dutch oven, combine chicken broth and water; bring to a boil. Add barley; reduce heat. Cover and simmer for 35-40 minutes or until barley is tender. Cool slightly.
In a small bowl, combine the oil, vinegar, garlic, chili powder and cumin; pour over barley and toss well. Gently stir in the remaining ingredients. Transfer to a serving bowl; cover and refrigerate overnight. Yield: 24 servings.