Place potatoes in a pot with water to cover. Bring to a boil, cover and simmer, stirring to ensure even cooking, until a thin-bladed paring knife or a metal skewer inserted into a potato can be removed with no resistance, 25 to 30 minutes. Drain, rinse under cold water and drain again. Cool slightly.
Cut warm potatoes into 3/4-inch dice with a serrated knife. Layer them in a bowl, seasoning with vinegar, salt and pepper as you go. Cut eggs, celery and pickle in 1/4-inch dice and thinly slice scallions. Add to potatoes, along with parsley. Stir in mayonnaise and mustard until everything is combined. Chill, covered, before serving.
Copyright 2004 USA WEEKEND and columnist Pam Anderson. All rights reserved.
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