Gather potatoes in a large saucepot, add water to cover. Bring to boil, then reduce heat while mainintaing boil. Boil potatoes uncovered 10-12 minutes.
When potatoes become tender, drain water, set potatoes aside.
Wash pot, then add celery and onion to it on medium heat. Cook 5 minutes . Add bacon and cook off for 5 minutes or until brown.
When bacon is ready set aside. Drain grease into a glass cup and save for later.
In a separate saucepan, whisk together 1 cup water, apple cider vinegar, sugar, cornstarch and black pepper.
When cool enough to handle, slice or dice potatoes; return to saucepan with celery and onions.
Add vinegar mixture, tossing to combine. Add bacon and whisk in bacon grease to create a sauce.
Simmer mixture 10-12 minutes or until heated through. Serve warm.