Place potatoes into a large pot and cover with salted water; bring to a boil. Reduce heat to medium-low and simmer until tender, about 20 minutes. Drain; allow potatoes to cool slightly. Peel and slice potatoes. Mix potatoes and onions in a bowl; stir in mustard, salt, and black pepper.
Bring vegetable stock to a boil in a small saucepan, pour over potato mixture and stir to combine. Stir in vinegar and let rest for 10 minutes. Stir in vegetable oil and season with salt and black pepper if desired.
This recipe is excellent warm or cold. It is usually eaten with German sausage, and is great for any family gathering. Typically in southern Germany, this potato salad is served in a salad. That’s right, in a salad! It was always my favorite surprise at the end of my salad. I could not wait to get to the potato salad at the bottom. Hopefully you will enjoy this recipe as much as I do!
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