Place the whole raw pork butt into the insert of a large slow cooker, fat side up. If needed, trim only thick, hard pieces of surface fat, but leave a good layer for flavor and moisture.
Raw pork butt in a slow cooker before seasoning
Raw pork butt in a slow cooker before seasoning
Sprinkle the kosher salt evenly over all exposed surfaces of the pork butt, patting gently so it adheres.
Pour the entire bottle of cola directly over the raw pork butt in the slow cooker, making sure the meat is mostly surrounded by liquid. It’s fine if the top isn’t fully submerged.
Cover the slow cooker with the lid and cook on LOW for 8–10 hours, or on HIGH for 5–6 hours, until the pork is very tender and easily pulls apart with a fork. Avoid lifting the lid frequently, as this extends cooking time.