When cooking roasts, one of the best tools you can use is an oven-safe meat thermometer that you can set to alert you when the meat reaches your desired temperature. You don't want to overcook an expensive roast, and you also don't want the middle to remain completely raw. Ideally, you want the inside to be medium-rare, 130°F. (The USDA recommends cooking roasts to an internal temperature of 145°F.)