Cook potatoes in boiling salted water, ... together mayonnaise or salad dressing, mustard, vinegar, salt and pepper; add to potato mixture. Stir lightly to coat. Serve warm.
In large bowl combine potatoes, ... together mayonnaise or salad dressing, pickle juice, salt, pepper, ... mayonnaise mixture into potato mixture. Chill. Garnish with additional hard-cooked egg slices, if desired. Makes 6 to 8 servings.