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Prepare the Ribs:
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Preheat your oven to 275°F (135°C).
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Remove the membrane from the back of the ribs. Slide a knife under the membrane at one end of the ribs and use a paper towel to grip and pull it off.
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Make the Dry Rub:
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In a small bowl, mix together the brown sugar, smoked paprika, garlic powder, onion powder, black pepper, salt, chili powder, cumin, mustard powder, and cayenne pepper (if using).
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Season the Ribs:
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Rub the olive oil over both sides of the ribs.
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Generously sprinkle the dry rub over both sides of the ribs, pressing it into the meat with your fingers.
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Wrap and Cook:
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Place each rack of ribs on a large piece of aluminum foil, meat side up. Wrap the ribs tightly in the foil, ensuring they are completely sealed.
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Place the wrapped ribs on a baking sheet and bake in the preheated oven for 2.5 to 3 hours, or until the ribs are tender and the meat is pulling away from the bones.
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Finish with Barbecue Sauce:
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Carefully remove the ribs from the oven and unwrap them.
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Preheat your broiler.
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Brush the ribs generously with barbecue sauce on both sides.
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Place the ribs under the broiler for about 5-7 minutes, or until the sauce is caramelized and bubbly. Watch closely to prevent burning.
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Serve:
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Remove the ribs from the oven and let them rest for a few minutes before cutting into individual ribs.
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Serve with additional barbecue sauce on the side, if desired.