While the pressure is releasing, in a small bowl stir together the cornstarch and water.
Open the pot and stir in the cornstarch mixture. Press the Cancel button to reset the cooking program, select the Sauté setting, and cook for 30 to 60 seconds to thicken the sauce. Spoon the pork into a serving bowl or onto plates and sprinkle with the green onions. Serve the steam rice alongside.