In a medium bowl, combine mayonnaise, sour cream, lemon juice, mustard, and salt. Whisk until well combined. In a separate bowl, toss together cooked chicken, celery, pecans, grapes, and tarragon. Add mayonnaise mixture, stirring to blend.
Notes
*Rotisserie chicken may be used.
Recipe by Cottage Journal at https://thecottagejournal.com/spring-lunch-menu/