1: In a large bowl combine cool shredded chicken, celery, green onion (if using), grapes, parsley, and tarragon.
2: In a small bowl whisk the mayonnaise, Dijon mustard, and lemon juice. Season with salt and pepper.
3: Gently fold in the mayonnaise mixture into chicken and vegetables.
4: Mix until everything is well combined.
5: Let chill in the fridge for at least an hour before serving.
