Perfect Prime Rib

"[Photographs: J. Kenji Lopez-Alt] Note:This recipe works for prime rib roasts any size from 2 ribs to 6 ribs. Plan on 1 pound of bone-in roast per guest (each rib adds 1.5 to 2 pounds to the roast). For best results, use a dry-aged, prime grade or grass-fed roast. Cooking time is identical regardless of size of roast. To further improve the crust, allow it to air-dry, uncovered in the refrigerator on a rack overnight before roasting. Seasoning with salt up to a day in advance will help the seasoning penetrate the meat more deeply. About the author: J. Kenji Lopez-Alt is the Chief Creative Officer of Serious Eats where he likes to explore the science of home cooking in his weekly column The Food Lab. You can follow him at @thefoodlab on Twitter, or at The Food Lab on Facebook. Every recipe we publish is tested, tasted, and Serious Eats-approved by our staff. Never miss a recipe again by following @SeriousRecipes on Twitter!..."