German Potato Salad :this can be made as hot salad or cold salad.
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According to the author
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the main selection of the main ingredient "Potato" makes the salad a good German Potato Salad.It should be a firm red skin potato but the russet also works.

Secondly The Dressing
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The typical dressing is a very simple vinaigrette that is equal parts water, vinegar and sugar. However all vinegars are a bit different so you need to do some experimenting. Rice and distilled vinegars are milder, but a cider vinegar works well also. Too strong a flavored vinegar like a tarragon vinegar may hide the flavor of the bacon and onions. If the dressing is too strong just add a bit more water.
If you are making a cold German potato salad a simple vinaigrette will work well.

The Bacon
The secret of getting that yummy flavor to your hot German potato salad is using a bit of the bacon fat in your dressing. This is accomplished easily by frying the bacon up and then adding the onions and potatoes in the same pan.

The Onion

The onion for a hot German potato salad needs to be cooked which sweetens it. . Raw onion just doesn't give the same flavor.

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Hot German Potato Salad Recipe
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http://www.kitchenproject.com/german/recipes/GermanPotatoSalad/EmmaHotPotatoSalad/FinishedSalad.jpg

Ingredients:
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Boil in their jackets, peel and slice:
4 large potatoes
Dice: 5 thick slices of bacon

Prepare:
1 Cup chopped onion
Mix dressing ingredients in measuring cup:
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¼ Cup wine vinegar
¼ Cup water
¼ Cup sugar
Use to taste: salt and pepper

1.Fry the diced bacon in a large skillet over medium heat, stirring often, until almost crisp.
2 . Add chopped onion and continue stirring until onion is cooked and turns slightly golden brown.3 . Add mixed dressing ingredients, heat and stir until mixture boils and sugar is dissolved.
Add sliced potatoes, mixing everything together well.
5. Season with salt and pepper.
6. Continue cooking, stirring frequently, for at least 10 minutes, or until the potatoes have absorbed all the liquid and are heated through. Continue heating and turning the mixture over for another 5 to 10 minutes. May allow to stand for additional 10-15 minutes to let the flavors blend completely.

German Potato Salad
cold style ----------------
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http://www.kitchenproject.com/german/recipes/GermanPotatoSalad/images/potato_salad.jpg

Ingredients:

8 to 10 med. sized potatoes
6 hard boiled eggs
1 med. chopped onion
1/4 cup white vinegar
salt & pepper to taste
1/2 cup salad oil

Boil , cool and slice potatoes Slice eggs thinly add chopped onion, mix together.
Add oil & vinegar.
Add salt & pepper.
May add small amount of water or oil if it seems dry.

Hot German Potato Salad

"In Delano, Minnesota, Marlene Muckenhirn makes these zesty salad with potatoes, celery and onion. It's a terrific side dish when served warm with crumbled bacon and fresh parsley sprinkled on top."

INGREDIENTS
8 medium potatoes, cut into 1/4-inch slices
2 celery ribs, chopped
1 large onion, chopped
1 cup water
2/3 cup cider vinegar
1/3 cup sugar
2 tablespoons quick-cooking tapioca
1 teaspoon salt
3/4 teaspoon celery seed
1/4 teaspoon pepper
6 bacon strips, cooked and crumbled
1/4 cup minced fresh parsley

DIRECTIONS
In a slow cooker, combine potatoes, celery and onion. In a bowl, combine water, vinegar, sugar, tapioca, salt, celery seed and pepper. Pour over potatoes; stir gently to coat. Cover and cook on high for 4-5 hours or until potatoes are tender. Just before serving, sprinkle with bacon and parsley.