Instructions

  1. Toss potatoes in oil with herbs and salt and pepper to taste.
  2. Arrange potatoes, cut side down, in a single layer on a cookie sheet.
  3. Place pan on lowest rack of cold oven then heat oven to 450°F.
  4. Roast until cut side is golden brown and potatoes are tender, 20 to 25 minutes.
  5. Place potatoes in a large bowl and add olives, onion and parsley.
  6. Whisk vinegar, mayonnaise, garlic, a big pinch of salt and a couple of grinds of pepper in a 1-cup glass measuring cup.
  7. Gradually whisk in oil, first in droplets, then in a slow, steady stream.
  8. Pour dressing over warm potato mixture and toss to coat.
  9. Serve at room temperature for best flavor.