Remove the membrane from the back of the ribs. This is a thin, papery layer that can make the ribs tough. You can usually get a knife under one edge and peel it off with a paper towel for grip.
In a small bowl, combine all the ingredients for the rib rub. Mix well.
Generously rub the spice mixture all over both sides of the ribs, ensuring they are fully coated.
Preheat your oven to 300°F (150°C).
Wrap the seasoned ribs tightly in heavy-duty aluminum foil. Place on a baking sheet.
Bake for 2.5 to 3 hours, or until the ribs are tender and the meat is starting to pull away from the bone.
While the ribs are baking, mix the BBQ sauce and apple cider vinegar in a small bowl.
Carefully remove the ribs from the oven and unwrap them. Discard any accumulated liquid.
Brush the ribs generously with the BBQ sauce mixture. Return the ribs to the oven, uncovered, for another 15-20 minutes to allow the sauce to caramelize.
Remove from oven, let rest for 5-10 minutes, then slice and serve.
Notes
For extra smoky flavor, consider using a smoker or grill instead of the oven. You can also add a splash of liquid smoke to the BBQ sauce mixture.