01 -
Place the diced potatoes in a large pot with cold, salted water. Bring to a gentle boil and cook until fork-tender, approximately 15 to 20 minutes. Drain and let cool completely to prevent breaking.
02 -
Wrap each beet tightly in foil and roast in a 400°F oven for about 40 minutes until easily pierced with a knife. Allow to cool, then rub skins off under running water and dice into small cubes.
03 -
In a mixing bowl, whisk together olive oil, balsamic vinegar, Dijon mustard, salt, and freshly ground black pepper until the dressing is thick and glossy.
04 -
Add the cooled potatoes and diced beets to the vinaigrette. Gently fold with a spatula to evenly coat without mashing the potatoes or turning the salad pink.
05 -
Arrange a bed of arugula or spinach on serving plates if using. Spoon the salad over the greens and sprinkle with crumbled feta cheese. Serve chilled or at room temperature.