Ingredients
2 1/2 pounds small red and Yukon Gold potatoes, cut into 1/4-inch slices
Kosher salt and freshly ground pepper
1 tablespoon Dijon mustard
2 tablespoons white balsamic vinegar
1 tablespoon peperoncini brine, plus 2 tablespoons sliced peperoncini
1 1/2 teaspoons fresh thyme leaves
1/4 cup extra-virgin olive oil
3 cups lightly packed wild or baby arugula
Flaky sea salt, such as Maldon, for serving
Preparation
In a pot, cover potatoes with 2 inches of generously salted water. Bring to a boil, then reduce heat to medium and cook until just tender, about 5 minutes. Whisk together Dijon, vinegar, brine, and thyme. Whisk in oil; season with kosher salt and pepper.
Drain potatoes. Transfer to a rimmed baking sheet; let cool slightly. Drizzle with half of dressing. Toss arugula with peperoncini and a few tablespoons of dressing. Arrange potatoes and arugula mixture on a platter; drizzle with dressing. Season with flaky salt and pepper; serve.
