Place spareribs meat side down on a double-layer of paper towel. Remove membrane from back of spareribs by pulling it off with a paper towel. Start by poking the membrane end loose with a butter fork until you have a good grip of it, then pull it off with a paper towl.
In a small glass bowl mix the seasoning. Rub onto both sides of the spareribs pressing down with your fingers. Let it stand for at least 30 minutes for better flavor.
Add 1 cup of water to the instant pot and place trivet on the bottom. Place rack of ribs standing on it's side, meaty part on the outter side. Cover and cook on high pressure for 35 minutes. When done allow for NPR (natural pressure release).
Meanwhile turn oven on broil.
Remove spare ribs from instant pot but pulling out the trivet. Place spareribs on a sheet pan and brush with BBQ sauce on both sides. Broil for 2-3 minutes. (This step is optional but it gives the spareribs a nice finish)
Remove from ovena and serve with a side of barbecue sauce. Top with fresh scallions (optional)