Cut pork into 6 even pieces. Place pork in a large bowl with oil and seasoning mix, and toss to coat.
Place 1/2 cup water in a large frying pan. Place over medium heat, then bring to a simmer. Add pork and cook, covered, for 20 minutes, turning pork halfway through cooking time or until sauce is thick and pork is cooked through. Remove from heat. Stand, covered, for 10 minutes. Using 2 forks, roughly shred pork, then stir to coat in pan juices.
Meanwhile, combine avocado, onion, coriander and lime juice in a bowl. Season.
Heat tortilla pockets according to packet instructions. Fill tortilla pockets with pork mixture,cabbage and avocado salsa. Serve with tomato salsa.