By Andrine Redsteer

Beef tenderloin is often cooked as a whole roast. Cooking times vary, depending on the size of the tenderloin. Many recipes involving beef tenderloin call for a 2 1/2 to 3 lb. cut. Beef tenderloins retain their shape when tied with kitchen string. If you're unsure how to tie the tenderloin yourself, a butcher can do it for you. Have a meat thermometer handy, as using a meat thermometer is better than relying on a timer alone if you want an accurate temperature reading.

Use a meat thermometer to get an accurate temperature reading when cooking beef tenderloin.

Step 1

Preheat your oven to 425 F. Prep the tenderloin according to your favorite recipe. Many recipes involve rubbing the tenderloin with olive oil and seasoning it before cooking.

Step 2

Place the tenderloin on a roasting pan. Roast the tenderloin, uncovered, in a 425 F oven. Turn the tenderloin during the roasting process to ensure it's evenly cooked on both sides.

Step 3

Insert a meat thermometer into the center of the tenderloin. For a 2 1/2 to 3 lb. tenderloin, a meat thermometer should read 145 F for medium-well. For the same size tenderloin, medium-well should take roughly 40 to 45 minutes.

Step 4

Remove the beef tenderloin from the oven and let it rest for about 10 minutes before eating.