Ingredients

  • 2 pounds (900 g) waxy potatoes, all about the same size, rather small to medium ones
  • 1 medium yellow onion, diced finely (3.5 oz / 100g)
  • 2 tablespoons (28 g) unsalted butter
  • 1/3 cup (80 ml) white wine vinegar or mellow apple vinegar
  • 3/4 cup 1 tablespoon (200 ml) vegetable broth
  • 3/4 tablespoon tarragon mustard (substitute with savory-hot mustard like spicy brown if you can not find)
  • 1/3 cup (80 ml) sunflower oil (or any other neutral-tasting oil)
  • 1 teaspoon (8 g) fine sea salt or table salt
  • Chopped, flat parsley for garnish

Method

  • Simmer the potatoes for 25-30 minutes, or until tender and they can be easily pierced with a fork. Drain the potatoes and set aside to cool slightly.
  • When potatoes are cool enough to handle but still warm, peel and cut them into thin slices (not thicker than 1/8 inch). Set aside in a big bowl.
  • Heat butter in a pan over medium heat, add diced onion and cook until translucent, 3-4 minutes.
  • Deglaze onion with vinegar, add soup and salt.
  • Bring the liquid to a boil and let it cook over low medium heat for 2 minutes.
  • Toss the potatoes with vinegar-broth, add mustard, give it a stir, then add oil and mix carefully.
  • Cover bowl with a lid and let rest for at least 30 minutes so the potatoes are able to absorb some of the dressing.
  • Potato salad is consumed either warm (after 30 of resting) or chilled (when resting longer).
  • Before serving, give the salad a stir, taste it, add little salt if necessary and sprinkle with chopped parsley.
  • NOTE: This salad can easily be prepared in advance. The dressing is good for a 1/2 hour to 3 hour resting time. If you let the salad rest longer - over night for example - prepare slightly more dressing, because the potatoes will continue absorbing it. Otherwise, the salad might turn out too dry.