Ingredients

  • 4 large Yukon gold potatoes
  • Kosher salt and freshly ground black pepper
  • 4 tablespoons canola oil
  • 6 tablespoons unsalted butter
  • 2 large yellow onions, halved and thinly sliced
  • Pinch of sugar
  • 4 teaspoons white wine vinegar
  • 1/4 cup chopped fresh flat-leaf parsley
  • 2 sprigs fresh thyme, leaves removed, plus more for garnish

Method

  • Put the potatoes in a large pot and cover by 2 inches with cold water.
  • Add 1 tablespoon of kosher salt and bring to a boil over high heat.
  • Cook until a knife inserted into the center meets some resistance, 15 minutes.
  • Drain and let cool slightly.
  • While the potatoes are cooking, heat 2 tablespoons of the oil in a large saute pan over medium heat.
  • Add 2 tablespoons of the butter, the onions, sugar and some salt and pepper.
  • Cook, stirring occasionally, until the onions are soft and caramelized.
  • Remove to a platter.
  • Slice the potatoes in half lengthwise, then crosswise into 1/2-inch-thick half-moon-shaped slices.
  • Sprinkle both sides of the potato slices with salt and pepper.
  • Heat the remaining 2 tablespoons oil in the same saute pan over medium-high heat.
  • Add the potatoes in a single layer, then add 2 tablespoons of butter and cook on both sides (being careful not to break the slices) until lightly golden brown and crisp around the edges, about 7 minutes.
  • Stir in the onions, remaining 2 tablespoons butter and the white wine vinegar.
  • Finish with the parsley and thyme.
  • Serve hot, garnished with thyme sprigs.