Place chicken stock in pan, add chicken; cover and bring to a boil, reduce heat and simmer 10 minutes or until chicken is tender; drain and cool. Add rice gradually to a large pan of boiling water. Boil rapidly, uncovered, for 10 minutes or until rice is tender; drain and cool. Cut mango into thin strips. Cut chicken into slices. Make dressing by combining all ingredients in a blender. Combine rice, onions and French dressing in a bowl. Place on plates; top with chicken and mango dressing.