I made a big slow cooker full of barbecue beef, spooned it onto buns, topped it with as many onion rings as I could fit, and a bit of extra sharp cheddar cheese, and I was happy.
In a bowl, whisk together the ketchup, brown sugar, apple cider vinegar, mustard, Worcestershire sauce, liquid smoke, salt, pepper and garlic powder. Pour the mixture over the beef.
Cover and cook on low 8-10 hours or until the beef is tender.
Carefully remove the beef from the slow cooker and shred with a fork.