Preparation

• Position a rack in the center of the oven and heat the oven to 425°F.
• Toss the potatoes with the oil and 1/2 tsp. salt on a large rimmed baking sheet, and arrange them cut side down in a single layer. Cover the baking sheet tightly with foil, and transfer to the oven to steam for 20 minutes.
• Carefully remove the foil, rotate the baking sheet, and roast until the bottoms of the potatoes are beginning to brown in spots, 15 to 20 minutes. Flip the potatoes with a thin metal spatula, and continue roasting until the potatoes are tender, 7 to 10 minutes more. Immediately toss with the lemon zest and oregano, and serve.