Sprinkle roast with salt and pepper. Tie with kitchen twine. Set aside.
In a small bowl, stir together rosemary, garlic, and 4 tablespoons oil.
In a 10-inch cast-iron skillet, heat remaining 2 tablespoons oil over medium heat. Add roast; sear, turning occasionally, until browned, about 3 minutes per side. Gently press rosemary mixture onto roast.
Bake until a meat thermometer inserted in the thickest portion registers 135°, about 1½ hours, covering with foil halfway through baking to prevent excess browning. Remove from skillet; let stand for 10 to 15 minutes.
Meanwhile, bring rendered juices in skillet to a boil over medium-high heat; cook until thickened, about 10 minutes. Serve juices over roast.
Recipe by Southern Lady Magazine at https://southernladymagazine.com/rosemary-and-garlic-beef-roast-recipe/