01 - Remove the beef from the refrigerator 30 minutes before cooking to allow it to reach room temperature.
02 - Set the oven to 400°F (200°C, gas mark 6).
03 - Combine olive oil, Dijon mustard, parsley, rosemary, thyme, garlic, salt, and pepper in a small bowl to create a fragrant paste.
04 - Pat the beef dry with paper towels. Arrange the onion, carrots, and celery at the bottom of a roasting pan to create a trivet and place the beef on top.
05 - Rub the herb paste evenly all over the beef, pressing gently to adhere.
06 - Roast the beef in the preheated oven for 20 minutes at 400°F (200°C).
07 - Reduce oven temperature to 350°F (180°C, gas mark 4) and roast for approximately 1 hour 10 minutes, or until a meat thermometer registers 130°F (54°C) for medium-rare or 140°F (60°C) for medium doneness.
08 - Remove from oven and loosely cover with foil. Let rest for at least 20 minutes to allow juices to redistribute.
09 - Carve the beef and serve with pan juices and roasted vegetables as desired.