We love salt-and-vinegar potato chips; why not use the same flavor combination when roasting potatoes?
Preheat oven to 450F and place a rack in the upper third of the oven.
Toss potatoes in a large roasting pan with oil and pepper.
Roast potatoes, turning occasionally with a metal spatula, until golden brown and tender, 30 to 35 minutes. Sprinkle with vinegar and salt to taste, toss and serve.
2 starch, 1/2 fat