Step 1: Place potatoes in lg pot of cold, salted water.
Step 2: Bring to a boil over high heat, then decrease the heat to medium-low.
Step 3: Drain well in a colander.
Step 4: While still warm, transfer the potatoes to a baking sheet and drizzle with the vinegar, and set aside to cool to room temperature.
Step 5: To make dressing, combine mayo, sour cream, and mustard in a large bowl.
Step 6: Season with salt & pepper.
Step 7: To assemble, add the cooled potatoes, onion, celery, and parsley to the dressing and stir to combine and coat.
Step 8: Taste and adjust for seasoning with salt & pepper.
Step 9: Serve at room temperature or chilled.
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