Preheat the oven to 400F. Mix salt, spices and thyme leaves (from 1-2 sprigs) in a bowl. Rub the pork crown on all sides with olive oil, and then rub with a mixture of salt, spices and thyme.
Make punctures with a knife all over the pork. Cut the garlic cloves into thin sticks, insert them into the punctures in the pork. This will give the pork a garlicky flavor. Use twine to stand rack up with bones facing up, tight so it stays in a round shape.
Add sprigs of thyme, rosemary, and sage to the pork. Place the pork crown on a roasting rack inside your roasting pan with bones sticking up. Wrap the ends of the ribs in foil so that they do not char.
Cover the oven dish with a foil tent and place in the oven. Roast 20 minutes. Then lower the temperature to 320F and roast for another 2 hours (the last half hour without foil).
The temperature inside the roasted pork should be 140F when done. Allow to sit and rest for 10 minutes. Remove sprigs of herbs, as well as kitchen string and foil. Serve the pork crown whole or cut into portions according to the number of ribs.