1. Preheat oven to 300 degrees Fahrenheit and place a raised metal grill insert into an oven tray lined with tinfoil.
2. Combine the paprika, brown sugar, garlic powder (1 tsp), onion powder, and salt. Rub it onto both sides of the ribs.
3. Layout the ribs onto baking sheet rack and cook for 30 minutes.
4. Meanwhile, heat the pineapple juice in a saucepan. Reduce by half, then add the ketchup, tomato paste, molasses, and cider vinegar. Whisk well to combine. Add the garlic powder (1/2 tsp) and cayenne pepper, and whisk well to combine.
5. Brush ribs with the sauce and cover loosely with tinfoil, cooking for 1 hour and 20 minutes.
6. Remove foil and broil on high-heat for 5-10 minutes until slightly caramelized. Brush with more sauce and serve.
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