Place the sliced onions evenly on the bottom of the slow cooker.
Place the pork roast on top of the onions.
Add ½ cup liquid to the slow cooker.
In a small bowl or a mug, combine all the spices. Sprinkle liberally over the pork shoulder.
Cook the pork on low for 10 hours.
When the meat is done, shred the meat with two forks. Add the remaining ½ cup liquid if the pork has not released many juices. Stir to combine and serve.
You can also top it with some fresh pico de gallo and a squeeze of fresh lime juice.
