Make sure your rack is in the middle of the oven.
Preheat your oven to 500 degrees
Combine the soft butter, black pepper, thyme, oregano, and rosemary in a little bowl. Mix it all up until the ingredients are well combined.
Smear the flavored butter all over the room temperature roast on all sides (even covering the bones).
Sprinkle the salt, generously, over the entire roast, on all sides. Iron Chef Michael Simon says, "Use twice as much salt as you think you need." Remember this is a BIG cut of beef so only a fraction of that salt will end up on your plate.
Get out a calculator (I use my iPhone's calculator). Punch in the exact weight of the roast from it's label (I always tell the butcher I NEED the weight on the label to ensure it's not forgotten). Times the exact weight of the roast by 5 minutes, and you will get the amount of time the roast will be cooking at 500 degrees. Example: if your roast weighs 4.8 pounds 4.8 x 5 = 24 minutes, you would cook the roast in the oven, at 500 degrees, for 24 minutes.
If your cooking time is for example 24.6 minutes, round up to the nearest minute, which would be 25 minutes.
Place your roast, on a rack positioned in the middle of the oven, and cook it at 500 degrees for the amount of time your math equation says. Once you close the oven door, set a timer so you don't forget!
Once your timer rings, turn OFF the oven but do NOT...I repeat....do NOT open the oven door. Walk away from the oven and leave the roast in there for 2 hours (see notes about leave-in thermometer) .
After two hours, take the roast out of the oven, and place it on a cutting board.
If you are making the au jus, follow the next steps, if you are not, cut the bones off the roast, slice it up into whatever size portion you feel like eating, and serve it up on warm plates!