Bring the pork rib roast out of the refrigerator about 1 hour before you plan to cook. Let it come to room temperature, then pat dry with paper towels.
Heat the olive oil in a large skillet. Sear the surface of the roast for about 3 minutes per side, or until lightly browned.
Preheat the oven to 325 degrees F.
Let the roast rest for a few minutes to cool down again. Rub the Dijon mustard onto the surface of the roast, then mix together the other seasonings and rub them into the surface as well.
Place a roasting rack into a tall-sided baking sheet.
Center the roast on the rack, fat side up. Put about 1 cup of water in the pan. Roast the meat for 2 hours, starting to check the internal temperature at 1 hour and 45 minutes.
Remove from the oven when the internal temperature reaches 145 degrees F. Let it rest for 5 minutes before carving and serving.