Let the roast rest at room temperature for at least 30 minutes.
Use a knife to remove the rib bones.
Lay the roast back on the bones and use butchers twine to tie the bones back to the roast.
In a bowl, combine the rosemary, thyme, parsley, oregano, chopped garlic, salt, pepper, onion powder and olive oil.
Season the rib roast liberally with the spice mix. Cover and leave in the refrigerator preferable overnight or at least 4 hours.
In the mean time, cut up the vegetables as shown and place in the roasting pan. They will give the gravy a better taste.
Transfer the roast to the preheated, 425-degree oven and roast for 20 minutes.
Reduce heat to 325°F and allow to roast for 2 to 2 1/2 hours. Use thermometer to check the internal temperature of the roast every 30 minutes; it should not exceed 130°F. Let the roast rest at least 20 minutes before slicing and serving.