Preheat your oven to 300°F and line a large baking sheet with heavy-duty aluminum foil.
Remove the thin membrane from the back of the ribs using a paper towel for grip and pat the meat dry.
In a small bowl, whisk together the smoked paprika, garlic powder, onion powder, sea salt, black pepper, and cumin.
Apply the spice rub generously to both sides of the ribs, pressing the seasoning firmly into the meat.
Place the ribs on the prepared baking sheet, drizzle with the first tablespoon of apple cider vinegar, and seal tightly with another sheet of foil.
Bake for 2.5 hours until the meat is tender and has started to pull away from the bones.
While the ribs roast, whisk the second tablespoon of apple cider vinegar with the Dijon mustard in a medium bowl and toss with the shredded cabbage.
Carefully open the foil, brush the ribs with the sugar-free BBQ sauce, and broil on high for 3 to 5 minutes until the glaze is caramelized.
Let the ribs rest for 5 minutes before slicing between the bones and serving with the crisp cabbage slaw.