1Remove the membrane from the back of the ribs by making a small slit with a paring knife and pulling it off, using a paper towel to help grip the membrane if needed.
2Mix the granulated onion, granulated garlic, paprika, smoked paprika, dried oregano, cayenne, black pepper, and chicken base in a bowl to create the spice rub.
3Apply the spice rub to the ribs, ensuring all sides are well-seasoned and the seasoning is packed into the meat.
4Place each rack on a sheet of aluminum foil sprayed with cooking oil spray, pour apple juice over the ribs, and wrap them tightly, double-wrapping to seal.
5Bake the ribs in the oven at 250 degrees for 3 to 4 hours.
6Remove the ribs from the oven and let them rest in the foil on the counter for 1 hour.
7Unwrap the ribs, apply a generous layer of barbecue sauce to all sides, add a cup of water to the pan to prevent burning, and place under the broiler to char.