- In a small bowl, whisk together brown sugar, cajun seasoning, salt, oregano, and onion powder. Pat ribs dry with a paper towel then rub spice mixture onto ribs.
- Brush about ½ cup barbecue sauce onto ribs and place in slow cooker. Pour water around the ribs and cook on low until tender, about 8 hours.
- Brush the remaining barbecue sauce on the ribs.