Step 1

Add potatoes to a large pot and cover with at least 1 inch of water. Generously salt the water (about 1 Tablespoon of salt), then bring to a boil and cook for about 10 minutes or until the potatoes can easily be pierced with a fork. Drain well and slice potatoes into thick discs or chunks. Set aside.

Step 2

Cook bacon in a large skillet over medium-high heat until crispy. Remove from the pan, crumble, and set aside, reserving at least 2 Tablespoons of the bacon grease.

Step 3

Cook the onions in the bacon grease over medium heat until softened and starting to brown, about 5 to 8 minutes. Add vinegar, water, sugar, salt, pepper, celery seeds, and mustard. Bring to a boil, then add potatoes, parsley, and half of the crumbled bacon. Toss to coat the potatoes and evenly heat everything through, then transfer to a serving dish. Sprinkle with the remaining crumbled bacon. Serve warm.