1. Place the beef in your slow cooker. Top with the onions, garlic, barbecue sauce, beer, and spices.
2. Cook on low heat for about 8 hours or until the beef is very tender. You want it to be tender enough that you can use a fork to pull the meat apart.
3. Remove the beef from the slow cooker and place it on a cutting board. Using two forks, shred the beef.
4. Skim off any extra fat from the slow cooker and place the shredded beef back in to cook on low heat for 30 to 45 minutes.
5. Remove the beef and place it in a strainer to allow the excess liquid to drain. If you would like to toss the beef in additional barbecue sauce, do it now. If needed, season with additional salt and pepper to taste. Your beef is ready to use for your sliders!
6. Divide the beef on the bottom of your slider buns. Top with the remaining bun pieces and secure the top bun with a toothpick. You will also need a 4-inch toothpick or wooden appetizer skewer to secure your slider once all the toppings are on it.

Notes

Cooking Time: 8½ hours to 2 hours and 45 minutes