To make the dry rub, combine all the ingredients in a medium bowl.
To prepare the ribs, remove the thin skin (membrane) on the back of the ribs. You may need to use a small sharp knife to pry on the corner, then pull the skin to peel it off.
Generously rub the ribs with prepared dry rub on both sides, patting the spices well into the meat.
To cook the ribs, place a rack in your Instant Pot. Pour water, apple cider vinegar and liquid smoke, if using. (You can use all water if you want to.)
Place the ribs in the pot, curling it around the sides of the pot.
Close the lids, make sure the valve is set to sealing. And set the Instant Pot to Meat/Stew (or Manual) setting for 25 minutes. (It took 15 minutes for the pot to come to pressure.)
Let stand for 10 minutes to naturally release the pressure, and then turn the valve to vent to quick release the remaining pressure. Carefully open the lid.
Using a set of kitchen tongs, carefully remove the meat onto a baking sheet, lined with an aluminum foil.
Generously brush on your favorite BBQ sauce on both sides.
To finish on the grill, preheat the grill to medium-high heat, and lightly oil grates using a paper towel soaked in oil. Grill the ribs until nice and crispy, about 10 minutes, turning it over half-way through.
To finish in the oven, preheat the broiler. Broil for 5-7 minutes, watching carefully not to burn.
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