Preheat oven to 475°F. Rinse potatoes and dry well with paper towels. Rub potatoes with oil. Cut each potato in half and sprinkle cut sides with salt. Put potatoes on a baking rack and let stand 10 minutes so salt can draw some water out of potatoes. Bake potatoes on the baking rack (not on a baking sheet) on middle rack of oven until cooked through, about 20 minutes. Increase temperature to 500°F. and bake
potatoes until puffed and golden, about 5 minutes more.
Serves 4