In a small bowl, combine the minced garlic, lemon zest, minced sage, mince rosemary, fennel seeds, and rinsed capers. Stir and crush the herbs until evenly combined. Sprinkle the herb mixture evenly over the opened pork shoulder, reserving some for the top. Roll up the pork to resemble its natural shape, with the fat side up. Secure the pork with kitchen string by tying it in 4 or 5 sections around the width at one inch intervals. Make one more loop around the length of the pork, looping the string around a couple of the tied sections so the string will not slip off. Tie the ends and secure. Trim any loose string. Sprinkle the outer surface of the pork with the remaining herb mixture and ground pepper.