Remove fat from pork; cut pork meat into 2-inch cubes and roughly chop fat.
Mix pork, garlic, olive oil, orange peel, orange juice, salt, bay leaves, black pepper, cumin, cinnamon, and 5-spice powder together in a bowl until pork is coated completely. Transfer mixture to a 9x13-inch baking dish. Place baking dish on a baking sheet and cover baking dish tightly with heavy-duty aluminum foil.
Bake in the preheated oven until pork is fork-tender, about 3 1/2 hours.
Set oven rack about 6 inches from the heat source and preheat the oven's broiler.
Transfer meat to a colander set over a bowl. Remove garlic, bay leaves, and orange peels from baking dish and pour accumulated juices from the baking dish over meat in colander into the bowl. Return meat to the baking dish and drizzle accumulated juices over each piece of meat.
Cook meat under the preheated broiler for 3 minutes. Drizzle more accumulated juices over meat and continue broiling until crispy, 3 to 5 minutes. Transfer pork to a serving plate and drizzle more accumulated juices over the top.