Bring a rib roast to room temperature and set oven or smoker to 275 degrees.
With a mixer, mix the ingredients for the rosemary salt. Rub rib roast with olive oil and rub generously with the rosemary salt. Place rib roast on a wire rack over a backing sheet and place in oven for 3-4 hours depending on the size of your roast. Use a meat thermometer to check the internal temperature and remove from oven when it is 5 degrees from your desired temperature.
Let the roast rest for 20-30 minutes before searing. Sear on each side for 60 seconds or until a crust develops.