Remove roast from the refrigerator 2 hours before roasting to bring the meat closer to room temperature.
Preheat oven to 450℉.
In the bowl of the food processor with the blade attachment pulse together thyme, rosemary, parsley, garlic, shallot, salt and pepper until chopped fine. Add butter and process until combined.
Pat roast very dry with paper towels and slather butter mixture over the entire roast.
Place the roast in a deep roasting pan and add ¼ cup of beef broth. Place in the oven for 20 minutes.
Reduce oven temperature to 300℉. Continue cooking for another 2-3 hours, removing roast when it reaches an internal temperature of 115℉-120℉ for medium rare. Transfer to a cutting board and cover loosely with foil. Let meat rest for 30 minutes. The temperature will continue to rise and will be perfectly medium rare once it reaches 125℉-130℉.
Au Jus
Drain most of the fat from the roasting pan, leaving about 1/4 cup behind in the pan. Place the roasting pan over a burner on the stovetop over medium heat. Once hot, splash in some of the broth and immediately begin scraping the bottom of the pan with a wooden spoon to remove the brown bits and deglaze the pan.
Pour in the remaining beef broth and bring to a boil. In a small bowl, whisk together the cornstarch and an equal amount of broth. Whisk into the pan.
Bring to a boil if needed to thicken. Remove from heat and pour into a serving dish.
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