Cube the potatoes and boil until they are almost tender. (Make sure they are not too soft, or they will turn to mush in the mix).
Drain the potatoes and place them in the refrigerator for two hours.
Cook and dice the eggs and set aside.
Chop the celery and green onions and set aside.
In a medium or large-sized bowl, combine the celery, sour cream, mayonnaise, mustard, green onions, apple cider vinegar, milk, salt, and pepper.
Add the eggs to the mix and combine.
Add the potatoes and combine.
Return to the refrigerator for at least an hour.
Enjoy!