Old-Fashioned Potato Salad

6 medium potatoes, peeled (2 pounds)
1 1/2 cups mayonnaise or salad dressing
1 tablespoon white or cider vinegar
1 tablespoon yellow mustard
1 teaspoon salt
1/4 teaspoon pepper
4 hard-cooked eggs, chopped

1- Heat 1 inch water (salted if desired) to boiling in 3-quart saucepan. Add potatoes. Cover and heat to boiling; reduce heat. Cook 30 to 35 minutes or until tender; drain. Cool slightly; cut into cubes.
2- Mix mayonnaise, vinegar, mustard, salt and pepper in large glass or plastic bowl. Add potatoes, celery and onion; toss. Stir in eggs. Cover and refrigerate at least 4 hours until chilled.

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