Rinse the roast under cool water. Pat dry with paper towels. Score the fat-cap with a sharp knife, every ½ inch in two directions. Place the roast on a baking sheet.
Dissolve 2 tbsp kosher salt in cool water. Dab a paper towel into the salty water, then use it to thoroughly wipe down the roast on all sides. Place the roast uncovered in the refrigerator. If you have a second refrigerator, use that one. This will make sure the temperature stays relatively constant because you won't be opening the refrigerator door as much.
Allow the meat to set undisturbed in the refrigerator for up to 1 week before roasting it. The roast will shrink noticeably, and the color will turn dark red as the beef flavor concentrates.
One day before roasting, wipe down the roast with olive oil, then sprinkle it with salt and pepper, or whatever dry or wet rub you wish to use.
Cover the seasoned roast with plastic wrap, and return to the refrigerator. Allow it to set in the refrigerator for one more night.
When you are ready to cook, remove the roast from the refrigerator. Allow the roast to come to room temperature. Remove the plastic wrap just prior to roasting it.