01 - Remove beef from fridge 30 minutes prior to cooking to allow it to reach room temperature. Preheat oven to 400°F (gas mark 6).
02 - Combine olive oil, Dijon mustard, parsley, rosemary, thyme, garlic, salt, and pepper in a small bowl to create a herb paste.
03 - Dry beef thoroughly with paper towels. Spread onion, carrots, and celery evenly in roasting tin forming a trivet. Position beef on top.
04 - Evenly coat beef with the prepared herb paste, pressing it firmly to adhere.
05 - Place beef in preheated oven and roast at 400°F for 20 minutes. Lower temperature to 350°F (gas mark 4) and continue roasting for approximately 1 hour 10 minutes until internal temperature reaches 130°F for medium-rare or 140°F for medium.
06 - Remove beef from oven and cover loosely with foil. Allow to rest for at least 20 minutes to retain juices.
07 - Carve beef into slices and serve alongside pan juices and roasted vegetables as desired.