Mix together brown sugar, paprika, garlic powder, onion powder, mustard powder, cumin powder, salt, and black pepper to create spice rub
Rub spice mix all over pork and place in slow cooker
Pour 1 cup beer over pork and cook on low for 10-12 hours
Transfer pork to roasting pan and skim ⅓ cup fat from slow cooker juices
Drizzle skimmed fat over pork and roast at 180C/350F for 20 minutes
Slice off fat cap, drizzle with more fat, and roast for another 15 minutes
For BBQ sauce: combine apple cider vinegar, tomato ketchup, water, molasses, brown sugar, mustard powder, garlic powder, Worcestershire sauce, salt, black pepper, and cayenne pepper in a saucepan
Simmer sauce over medium heat for 45 minutes, stirring occasionally, until thickened
Add ¾ - 1 cup of juices from slow cooker to sauce until it reaches syrup consistency
Shred the cooked pork and toss with most of the BBQ sauce
Serve in soft buns with slaw or shredded lettuce as sliders, or with sides like mac and cheese, cornbread, and coleslaw
