Mix together paprika, sugar, onion powder and brown sugar. Set aside one-half of the Rib Rub for the grilling and BBQ Sauce.
With the other half of the Rib Rub, massage it into the ribs and wrap with Saran Wrap.
Place in refrigerator overnight or for at least two hours.
Pressure Cook Ribs
Add diced onion, water, apple cider vinegar and liquid smoke to Instant Pot.
Place a trivet in the cooking pot and place ribs on trivet.
Lock on lid and close Pressure Valve. If using Baby Back Ribs, cook at high pressure for 15 minutes. If using St. Louis Style Ribs, cook at high pressure for 20 minutes.
When Beep sounds, wait 15 minutes and then release the rest of the pressure.
Lock on lid and close Pressure Valve. Cook on High Pressure for 2 minutes. When Beep sounds, wait 15 minutes and release the rest of the pressure.
Grill Ribs
Sprinkle the rest of the BBQ Rib Rub over both sides of the cooked ribs.
Finish the ribs outside on the Barbecue Grill or finish them in the oven.
Oven
Place ribs on cookie sheet and then place under the boiler for 5 minutes. Flip over and broil another 5 minutes or until nicely browned.
Serving
Serve the ribs dry and let guests add sauce, if desired, or slather the sauce over all the ribs and serve.
Notes
The BBQ Ribs Rub and Carolina BBQ Ribs Sauce are meant to compliment each other. DON'T COAT RIBS WITH THE SAUCE AND THEN BROIL. The sauce is a condiment that you use after plating of the ribs.