Put oven rack in lower third of oven and preheat oven to 450º.
Halve each potato lengthwise, then cut each half lengthwise
into 4 wedges. Toss potato wedges with oil, salt, and pepper
in a 17 by 11 inch shallow baking pan (about 1 inch deep) and
arrange in 1 layer. Roast potatoes, turning over once, until
golden brown and cooked through, 20 to 25 minutes.
Sprinkle with 2 tablespoons vinegar, shaking pan to distribute
vinegar evenly, then roast until vinegar is evaporated, about 3
Serve sprinkled with remaining 1/2 tablespoon vinegar and
salt to taste.
Makes 4-6 servings.