1. Make the Spice Rub: In a small bowl, combine brown sugar, smoked paprika, chili powder, garlic powder, onion powder, ground mustard, salt, black pepper, and cayenne pepper.


2. Preheat oven to 300F (150C).
3. For the most tender ribs, remove the thin membrane covering the underside of the ribs. To remove it, gently slide a paring knife under the membrane, and then use a paper towel and your hands to pull the silver skin away from the bones.

4. Generously season the meaty side, the back of the ribs and sides of the ribs with the spice mixture, using your hands to gently pat the seasoning to ensure it adheres. Transfer the spice-coated rack of ribs to a long baking dish (meat side up), cover it tightly with aluminum foil. Bake ribs at low temperature for about 2 hours, until tender.


5. Slice the oven-baked ribs and serve them. Optionally, you can finish these flavorful ribs by topping them with your favorite barbecue sauce,  and then broil (or use hot grill) for a few minutes, until the sauce is caramelized (keep a close eye on the ribs as they're placed under the broiler, so they don't burn).