Place potatoes in a pot and cover with water. Bring to a boil for 10 minutes.

Drain potatoes and let cool.

Fry bacon until crisp and set aside.

Cook onion in bacon grease until brown.

Add vinegar, water, salt, sugar and pepper to onions.

Bring to a boil and add potatoes and parsley.

Crumble bacon and mix in half.

Transfer to serving bowl and add remaining bacon on top.

Can be served hot or cold, Dijon mustard optional.