This is a great side dish for a picnic. However, it also works as a warm side-dish. I prefer a sharper, more acidic flavor, so do not add any sugar to temper the vinegar. However, you may add some sugar to taste when making the sauce. If you are serving warm then the initial cooking time for the potatoes can be reduced so they do not end up too soft at the end. In short, this is a simple, versatile side dish that pairs just as well with cold sandwiches and other picnic fare as well as a warm schnitzel.
A full written recipe may be found here: https://cook.karylstein.com/g/family/r/german-potato-salad