1. Cover the potatoes in water in a large pot, bring to a boil and cook until just tender, about 10 minutes, before draining.
2. Meanwhile, cook the bacon in a large pan and set aside, reserving 2 tablespoon bacon grease in the pan.
3. Add the onion to the pan and cook in the bacon grease until tender, about 5 minutes.
4. Add the garlic and cook until fragrant, about a minute.
5. Add the vinegar, mustards, and sugar mix well and season with salt and pepper to taste, before turning off the heat.
6. Add the potatoes, bacon, and parsley, toss to coat and enjoy while warm!
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