Cut the pork into large chunks and place in a Dutch oven or other large pan. Add the broth, onion, cumin, cilantro, oregano, chiles, adobo sauce, and bay leaves to the pan and stir gently to combine. Add enough water to just cover the pork. Bring the mixture to a boil on high heat and then reduce the heat to a simmer. Let cook until the meat pulls apart easily. This should take 2-3 hours. Remove the pork from the liquid with a slotted spoon and place the meat in a large baking pan. Let stand until cool then tear the meat into smaller chunks (do not shred at this time). Meanwhile, preheat the oven to 450 degrees F. Place the baking pan in the oven and bake for about 20 minutes or until the pork is browned and sizzling. If it starts to look too dry, add a little of the cooking liquid to the pan as needed. It should caramelize but not dry out. Remove from the oven and shred or chop the meat.