Boil potatoes as jacket potatoes. Potatoes possible Peel and slice while still hot. Dice the onion and let it steep in the broth. Add mustard, salt, pepper, sugar, vinegar and oil to the broth and pour hot over the potatoes. Stir. Add the diced bacon. Cover and let stand for 30 minutes. Season again to taste.
Depending on the type of potato, you have to add a little more broth, as almost everything is pulled up by the potatoes.