Heat the oven to 400º F. Evenly coat a large baking sheet with 1 tablespoon of the olive oil.Prepare Potato Wedges: Scrub and rinse potatoes then cut each potato into 6 long wedges and add to a large bowl. Cover potatoes with hot water and soak for 10 minutes. Drain potatoes, spread out onto a clean dish towel and pat very dry.Dry the bowl the potatoes were soaking in, add potatoes back to the bowl and toss with remaining 3 tablespoons of olive oil, salt, pepper and rosemary. Spread the potatoes in a single layer, cut side down on the baking sheet.Bake Potatoes: Bake the potatoes, turning to other cut side after 20 minutes, until lightly browned, crisp on the outside and tender inside; 35 to 45 minutes.Sprinkle with a little extra salt (if desired) and serve.