Boil chicken for about 25 minutes or until chicken is tender enough to pull. Bring water to boil first and add about 1 TB of salt to water then add chicken then cover.
After chicken is tender, pull apart with two forks then use a nice and chop the chicken finely.
Mince celery stalks then add into bowl with chopped chicken. Add in dill relish and mix.
Next add in mayo, 1 cup should be enough but add more if it looks too dry. Add, mustard and apple cider vinegar then mix well.
Lastly, add in salt and pepper to taste but the measurements above are a good starting point.
Cover and allow to sit in the refridgerator at least 2 hours before serving for flavors to work together, this does make a difference.