Best Crock Pot Pulled Pork Sandwiches

Name: Best Crock Pot Pulled Pork Sandwiches
Ingredients: * 2 cup apple cider or juice; * 1/2 cup ketchup; * 1/2 cup brown sugar; * 1 1/2 tsp cumin; * 1 1/2 tsp paprika; * 1 1/2 tsp garlic powder; * 1 tsp kosher salt; * 1 tsp cayenne pepper; * 1/2 tsp ground black pepper; * optional: 4 tbsp of your favorite barbecue sauce; * 1 medium onion divided into eighth; * 2-3 lb pork shoulder i used a pork shoulder butt roast, all tie; removed; * 4-6 sandwich bun try these egg bread bun if you'd like