Mix together the Basic Dry Rub ingredients in a bowl and set aside.
Add the broth and liquid smoke to your pressure cooker add the steamer rack if equipped or place a trivet in the pot. Goal is to keep the ribs above the liquid in the pot.
Rinse and dry the racks, remove the silver membrane from the back. Cut racks into 1 bone pieces. (Tesco in town was out of the good ribs, just the racks with a lot of white bone was available.)
Coat the rib sections with the dry rub you made.
Place the piece on the streamer rack and sprinkle with the onion and garlic. (I ran out of onion so just went with garlic.)
Place the lid on the cooker and lock, add the weight (jiggler). Place on high heat until the jiggler starts to move and vent pressure. Reduce the heat to low or medium low, but maintain the jiggler moving, indicating full pressure. Set your timer for 15 minutes.
When 15 minutes have passed, turn off the heat and move the cooker to an unused burner and allow a natural release of pressure, meaning hands off until you have indication the pressure is at zero inside the cooker, about 15-20 minutes.
When indications show zero pressure in the cooker, pull off the weight then remove the lid.
Place the ribs on a foil lined baking sheet and brush with BBQ sauce of your choice or simply olive oil, then broil or if using a counter top oven, use the top coil on the highest setting, until the ribs are crisped and slightly charred.
Serve and enjoy with sides of your choice.