Mustard Potato Salad with Onion, Celery, Sweet Pickle Relish and Mustard, Mustard Potato Salad

mayonnaise (soybean oil, water, corn syrup, egg yolk, contains less than 2% distilled vinegar, salt, mustard flour, calcium disodium edta, celery, sugar, distilled vinegar, salt, xanthan gum, alum, white mustard (vinegar, water, mustard seed, onion, sugar, salt, potassium sorbate, black pepper, beta carotene