Using a sharp knife, slice open the butt following the fat cap, until you are able to roll it flat

Make a paste with the olive oil, garlic, fresh herbs, fennel seeds and zest. Take half of the salt and sprinkle the inside of the butt. Pour paste on and spread evenly. Roll the meat up back onto itself creating a large pinwheel of pork and herbs. Secure thenroast together using string.

Cook pork in 350°F oven for 2 1/2 to 3 hours or until inside reaches 140°F.