Chop and dice up rutabaga and add to a pot of boiling water or flavor by using salted vegetable broth.
Cook rutabaga until fork tender. Drain water or broth and allow rutabaga to cool for several minutes in colander.
In a bowl, combine the cooled rutabaga, chopped onions, and celery together.
Gently fold in and mix the mayo, mustard, spinach dip, dill relish, salt and pepper to thoroughly combine with the rutabaga and veggies.
Refrigerate for a a couple of hours.