Prepare a large rimmed baking sheet with aluminum foil.
Remove the membrane from the back of the ribs, rinse and dry them.
Preheat your oven to 275°F (135°C).
In a small bowl, combine the ground cumin, paprika, garlic powder, onion powder, chili powder, brown sugar, smoked sea salt, and pepper. Mix well and rub this blend over the ribs.
Wrap each rack of ribs tightly in tinfoil, bony side up.
Bake the wrapped ribs in the preheated oven for about 3 to 4 hours, checking for tenderness after 3 hours.
Once cooked, switch the oven to broil, remove the tinfoil, and place the ribs bony side down on the baking sheet.
Generously coat the ribs with your prepared barbecue sauce and broil until bubbling and browning.
Optionally, you can add more sauce and broil again, watching closely to prevent burning.
Cut the ribs into portions and serve.