Cover a large, rimmed baking sheet with parchment paper. Drizzle ¼ cup oil onto the paper, then sprinkle it evenly with about ½ teaspoon salt and ¼ teaspoon pepper.
Place the sliced potatoes into a large bowl and cover them with hot water (I used hot water from the tap, but others have suggested that pipes can leach impurities into hot water, so it may be best to use cool tap water that has been heated on the stove). Let them soak for 10 minutes. This step releases some of the starch in the potatoes and lets them absorb moisture, which leads to crisp outsides and moist interiors.
Adjust an oven rack to the lowest position and preheat the oven to 475 degrees Fahrenheit. Scrub the potatoes and cut them, lengthwise, into 10 to 12 even wedges. The trick is to first quarter the potatoes lengthwise, and then cut each quarter lengthwise into 2 to 3 wedges (I sliced mine a little too thin).