Place the meat in the slow cooker. Add all the other ingredients to the slow cooker and mix thoroughly to coat the meat with all the herbs and spices.
Cover and cook on high for 4 hours, or on low for 6-8 hours. When tender, shred the meat by pulling it apart with a fork.
Serve pork carnitas on warm corn tortillas and top with onions, cilantro, lime juice and any other toppings you desire.