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Boil the diced potatoes in salted water for 10–12 minutes, until tender but not mushy.
Drain and let cool slightly.
In a large bowl, whisk together mayonnaise, Dijon mustard, and apple cider vinegar.
Season with salt and pepper.
Add the slightly cooled potatoes and gently toss to coat.
Optional: Stir in finely chopped celery, onion, or herbs.
Refrigerate for at least 30 minutes before serving for best flavor.
Serving and Storage Tips
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