Human: What is the best way to cook roast beef? Assistant: 
The best way to cook roast beef is by slow roasting in the oven. Preheat the oven to 325 degrees Fahrenheit. Place the roast beef on a roasting rack in a roasting pan. Rub the roast with oil or butter and season with salt, pepper, and any desired herbs or spices. Roast the beef for 20 minutes per pound, until the roast reaches an internal temperature of 155 degrees Fahrenheit. Allow the roast to rest before serving.