Place BBQ sauce, beer, sugar and vinegar in your slow cooker and whisk to combine.

On a wide plate combine together the paprika, chili powder, cumin and salt. Set the pork on the plate and roll to coat evenly with the spice mix.

Place oil in a large skillet set over medium-high heat. Add pork and sear on all sides.

Set pork in slow cooker, truning it to coat with the sauce.

Cover and cook on low setting for 8 hours, or until very tender.

Remove pork from sauce and set it in a bowl. Skim off any fat from surface of sauce, then cover and keep sauce warm in the slow cooker.

When pork is cool enough to handle, shred it with 2 forks, gettingg rid of any obviously fatty bits.

Add meat back to sauce, cover and heat through for 10 minutes.

Pile pork into buns and serve. Delicious when the pulled pork is topped with coleslaw.