1 4 pound boneless pork shoulder roast ¼ cup chopped fresh parsley 2 tablespoon minced fresh garlic 2 tablespoon dried oregano, crushed 4 teaspoon onion powder 4 teaspoon ground cumin 2 teaspoon ground black pepper 1 ½ teaspoon salt 1 orange, quartered 1 lime, quartered 1 medium onion, quartered