In dutch oven, boil diced potatoes for about 10 minutes, so soft, but do not fall apart when stuck with a fork. Drain and remove from dutch oven.
Add bacon and cook down for about five minutes. Add onion, cook until translucent.
Add apple cider vinegar, minced garlic, mustard, and sugar and whisk together.
Add potatoes to dutch oven and stir to coat. Add salt and pepper to taste. Serve warm.