Hot German Potato Salad

Boil 6 medium potatoes in their skins until tender. Peel and slice thinly into bowl. Fry six slices of bacon until crisp. In 1/3 c. o the bacon fat in a skillet, cook until yellow. Add in ¾ c. chopped or thinly sliced onion. Mix in flour, sugar, salt, celery seed, and pepper. Gradually mix in water and vinegar. Cook, stirring until mixture boils. Boil 1 minute, and then pour over potatoes. Add crisp bacon, broken into pieces (save some for garnishing). Cover and let stand until ready to serve. Garnish with pieces of crisp bacon and minced parsley or chives.  Reheat over hot water.