The beef should be brought to close to room temperature before you start to roast it so that it cooks more evenly. So, remove it from the refrigerator at least 1 hour, preferably 2 hours, before cooking. Open the wrapping, sprinkle all sides with salt, and wrap it up again.
Preheat your oven to 375°F (190°C).
Insert slivers of garlic into the roast: Pat the roast dry with paper towels. Use the tip of a sharp knife to make 8 to 10 small incisions around the roast. Put a sliver of garlic into each cut.
Rub with olive oil, sprinkle with salt and pepper: Rub olive oil all over the roast. Sprinkle with salt and pepper.
Place roast on rack, fat side up, with pan to catch drippings below: Place the roast directly on the middle oven rack, fatty side up, with a roasting pan to catch the drippings on the rack beneath it.
Placing the roast directly on the rack like this with a pan on the rack below creates a convection type environment in the oven, allowing the hot air to more easily circulate around the roast, so you don't have to turn the roast as it cooks.
Cook the roast initially at 375°F (190°C) for half an hour, to brown it. Then lower the heat to 225°F (107°C). The roast should take somewhere from 1 1/2 to 2 1/2 hours additionally to cook.
When juices start to drip from the roast, and it is browned on the outside, check the roast's internal temperature with a meat thermometer. Remove the roast from the oven when the internal temperature of the roast is 135° to 140°F (57°C to 60°C).
Place the roast on a cutting board and tent it with aluminum foil to keep it warm. Let it rest for 20 to 30 minutes before cutting.(Resting the cooked roast is important. If you cut into it too soon, the roast will lose more of its juices.)
