Ingredients: 2 pounds of Yukon gold potatoes (I used petite golden), 3.5 tablespoons of butter, 2 yellow onions finely chopped, 1/3 cup of white wine vinegar, 2/3 cup of beef or chicken broth, 1 tablespoon of Dijon mustard, 3 tablespoons of olive oil, 1 teaspoon of salt, freshly ground pepper, 2/3 cup loosely packed flat leaf parsley, minced.
- Wash the potatoes and put them in a pot of salted water just to cover. Boil with lid on and reduce heat to medium and cook until just tender. Depending on the size could be 20-30 minutes. Drain and cool. Per Luisa, Germans boil their potatoes the night before believing it helps retain a good shape. I might try that next time.
- Peel potatoes and cut in 1/8 inch slices (mine were bigger and they were fine.)
- Melt butter in 10 inch saute pan and add onions, mixing well and cook about 3 minutes. Add vinegar, broth, mustard, stir well making sure the mustard blends, about 3 minutes or less.
- Carefully whisk in the oil, pour hot dressing over potatoes and mix well. It takes a few minutes for dressing to absorb into the potatoes. Add more salt and pepper to taste. Finish with parsley.