Mix the smoked paprika, garlic powder, and salt together in a small bowl.
Cut each rack in half so they will fit in your pressure cooker. Rub the spice mixture on both sides of the ribs.
In a pressure cooker large enough to hold all the ribs, place the steamer basket at the bottom. Then stack all the ribs into the steamer basket. Stack the ribs in different directions to leave a little space between pieces. This will allow the meat to cook more evenly and quickly. If the meat is packed together, the meat in the center will be tougher.
Add roughly 500 ml (2 cups) water, or until the water level is just under the bottom of the steamer basket.
Cover the pot and close the pressure valve. Once under pressure, cook for 40 minutes.
Near the end of cooking, preheat the broiler.
Once cooked, release the pressure. Place the ribs on a baking tray, and brush on about 1 tbsp barbecue sauce per half-rack.
Broil for 3-4 minutes, or until the top of the ribs gets a little charred.
Serve with extra barbecue sauce and your favorite sides