To make Hellmann's potato salad, combine 2 pounds diced, boiled potatoes with 2 tablespoons white vinegar, 1 teaspoon sugar, 1/2 cup chopped celery, 1/2 cup diced onion and 1 cup mayonnaise. Add salt and pepper to taste, and chill the potato salad before serving if desired.
To make potato salad with dill, boil 3 pounds halved baby red potatoes, and allow the potatoes to cool. Add 1/2 cup sour cream, 1/3 cup mayonnaise, 1/4 cup chopped fresh dill, 2 tablespoons lemon juice and 6 sliced scallions to the potatoes. Add salt and pepper to taste, mix well and chill before serving.
To make German potato salad, peel and dice 2 pounds Yukon gold potatoes, and boil the potatoes until they are tender. Cook 1/2 pound thick-cut bacon in a skillet until it is crispy, and crumble the bacon. Reserve 1/4 cup bacon grease in the skillet.
Over medium-high heat, add 1/3 cup white vinegar, 1/4 cup sugar, 1 tablespoon Dijon mustard and 1 teaspoon salt to the reserved bacon grease. Whisk the mixture until it thickens, and pour the mixture over the potatoes. Add the crumbled bacon to the potato mixture, and top the potatoes with 2 tablespoons chopped chives. Serve the potato salad while it is warm.