How to Make It
Stir together the brown sugar, thyme, salt, garlic powder, onion powder, cayenne, allspice, and cinnamon in a small bowl. Rub the pork with the oil, and rub the spice mixture all over the pork. Place the pork in a 5- to 6-quart slow cooker. Add the onion and orange juice to the slow cooker. Cover and cook on LOW until the pork is tender, about 8 hours. Transfer the pork to a platter, reserving the cooking liquid in the slow cooker. Let the pork rest 10 minutes. Skim the fat from the reserved cooking liquid. Break the pork into large pieces, and toss with the reserved cooking liquid.
Stir together the salsa and pineapple in a small bowl; serve over the pork.