Heat potatoes in salted water to cover in a large saucepan to boiling. Reduce heat and simmer uncovered just until fork-tender, about 15-20 minutes. Drain; pare; cut crosswise into ⅛ to ¼ inch slices. Layer the warm potatoes in a medium serving bowl, sprinkling each layer with salt and pepper.
While potatoes are cooking, mix vinegar and mustard in a small bowl. Whisk in the oil in a thin stream until slightly thickened. Stir in remaining ingredients. Pour over warm potatoes and toss very gently to coat. Serve warm. Makes 6 servings.
Recipe by The Culinary Cellar at https://theculinarycellar.com/warm-potato-salad/