Cut the ribs into 1 bone pieces. (I also started to add the spring onion and garlic.)
In a large mixing bowl, add all the Marinade ingredients and mix together.
Add the ribs to the marinade and mix to coat all pieces well. Marinate the ribs at room temp for 30 minutes.
After 30 minutes have passed, sprinkle on the corn starch and mix that into the mixture.
Add 1 cup of water to your pressure cooker, place the steamer tray or trivet in the cooker, then add the contents of the mixing bowl (ribs and marinade) to the pressure cooker.
Add the lid and lock, place the weight (jiggler) on the top, and place on high heat. When the jiggler starts to move and vent pressure (indicating full pressure), reduce heat to low or medium low, just enough heat to maintain 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 you have to do nothing.
When you have indications of zero pressure in the cooker, about 15-20 minutes after you removed it from the heat, remove the weight then remove the lid.
Remove the ribs with tongs to a serving plate, drizzle some of the liquid over the ribs, sprinkle with spring onion and coriander as desired.
Serve with rice on the side.