Wash the potatoes, cook with the peel in the salted water, rinse, set aside.
Heat the butter in a saucepan, add the bacon and onion cubes, sauté. Stir in flour and brown while stirring constantly. Gradually pour in the meat broth. Let everything cook for about ten minutes.
In the meantime, peel and slice the potatoes.
Add the wine to the sauce, season well with vinegar, salt, pepper and sugar. Heat the potato slices in the sauce and let them steep a little.
It goes well with sausages, boiled beef or meat fritters and a green salad.