Dijon mustard, white balsamic vinegar, peperoncini brine, and fresh thyme make a bright, punchy dressing for Yukon Gold potatoes. Toss together while the spuds are still warm for maximum flavor absorption. Serve alongside our Tuscan Ribs.
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.