cooking.nytimes.com
Start with sweet potatoes, which are in season, beautiful and cheap, and roast them with red onion and olive oil. Roasting instead of boiling makes a huge difference: not only do you get a rich, smoky flavor, but the peeled exterior is toughened a bit so that the potatoes stay intact when tossed with the other ingredients. You can serve this sweet potato salad warm or at room temperature; it’s great both ways.