Preheat the oven to 500° F. Bring 1 quart of water to a simmer in the bottom of a steamer. Place the potatoes on the steaming rack, place the rack in the steamer, cover, and steam just until a knife inserted in a potato comes away clean, 10 to 12 minutes. (The potatoes should not be cooked through, or they will tend to fall apart.)

Transfer the steamed potatoes to a bowl and drizzle with oil. Carefully toss to coat evenly with oil. (The potatoes can be prepared to this point several hours in advance. Set aside at room temperature.)