For a rare roast beef, you should cook the meat for about 20 minutes per pound at 375°F (190°C). This will result in a juicy and tender roast with a pink center. Remember to use a meat thermometer to ensure the internal temperature reaches 130°F (54°C).
If you prefer your roast beef to be cooked to medium doneness, you will need to cook it for approximately 25 minutes per pound at the same temperature of 375°F (190°C). This will give you a slightly pink center with a more cooked exterior. The internal temperature should reach around 145°F (63°C).
Well-Done Roast Beef
For a well-done roast beef, cook the meat for about 30 minutes per pound at 375°F (190°C). This will result in a fully cooked roast with no pinkness in the center. Make sure to use a meat thermometer to ensure the internal temperature reaches 160°F (71°C).