Four to eight hours before you plan on cooking the pork, make the pork rub. Mix all the ingredients for the pork rub in a small bowl. Spread it generously on all sides of the pork. Refrigerate for 4 to 8 hours (or overnight).
3 pounds pork shoulder, 3 tablespoons paprika, 2 tablespoons brown sugar, 1 teaspoon black pepper, 1 teaspoon kosher salt
Spray the crock pot with cooking spray. Add the pork. There is no need to add any liquid. Cook on low for 7 to 8 hours.
Towards the end of the cooking time, make the BBQ sauce. Combine all the ingredients in a small saucepan over medium heat. Bring to a boil. Reduce to a simmer and cook for 15 minutes, stirring occasionally.
1 1/2 cups brown sugar, 1 1/2 cups ketchup, 1/2 cup apple cider vinegar, 1 tablespoon Worcestershire sauce, 2 teaspoons paprika, 2 teaspoons onion powder, 1 teaspoon black pepper
At the end of the cooking time, remove the pork from the slow cooker. Using 2 forks, shred the meat, discarding large pieces of fat. Return the shredded meat to the crock pot to keep warm, or make sandwiches right away, topping them liberally with BBQ sauce.
Notes
We always use our homemade BBQ Sauce when we make this recipe, because we love it. It takes a total of 20 minutes to make. If you would like to skip this step, you can use 2 1/2 cups of your favorite bottled BBQ sauce.