How to Make It
Combine first 5 ingredients in a large bowl, stirring with a whisk; set aside.
Place barley in a medium saucepan; cover with water. Bring to a boil. Reduce heat, and simmer 40 minutes or until tender. Drain and rinse under cold water. Drain. Add barley, chicken, and remaining ingredients to oil mixture; toss well to coat. Cover and chill.