Cut the ribs into four bone sections, individual bones or leave the racks whole.
In a small bowl, combine the dry rub ingredients. Evenly season the ribs with the mixture.
In the inner cooking pot of an electric pressure cooker, add 1 cup water. Use a trivet if the ribs are cut individually. Otherwise, stand the ribs up whole or in segments.
Close and lock the lid, making sure the steam knob is on Sealing/Locked. Pressure cook on high for 18 minutes. If you prefer the ribs less fall-off-the-bone and with a little tug on them, cook them for only 15 minutes. If you want them to completely fall-off-the-bone, cook for 20 minutes.
Meanwhile, if you are making the sauce, combine all sauce ingredients in a small pot. Bring the sauce to a boil on medium heat. Turn the heat down to medium low and simmer for 20 minutes, stirring occasionally.
Once the pressure cooking is done, quick release the pressure.
Preheat the broiler. Line a sheet pan with aluminum foil. Lay the ribs, bone side up and brush lightly with the sauce. Broil for 3-5 minutes until the ribs are slightly browned and caramelized.
Flip the ribs over, meat side up and brush liberally with remaining sauce. Broil for 6-8 minutes until ribs are browned and caramelized.
Alternatively, grill the ribs on the barbecue and baste with the sauce until browned and caramelized.
Baste on more sauce if desired. Serve on a platter with sauce on the side for dipping.