Place chopped apples and onion on the bottom of slow cooker. Season all sides of pork. Place pork in slow cooker. Add apple cider to slow cooker. Cook 4-5 hours on high or 8 hours on low.
Remove pork from slow cooker when it easily shreds. Optional: strain onions and apple and add back to shredded pork.
Toss with your favorite bbq sauce and enjoy!