Add a proper amount of nano-water into the Tupperware pressure cooker, put it on the steaming rack, put the prepared pumpkin cup into the steaming rack, cover the pressure cooker, and cook over high fire until the pressure indicator rises. When the first white line appears, cut the fire in half, the pressure indicator continues to rise by two squares, and then adjust the fire to a minimum. The stewing time is about 10 minute, and the specific time is adjusted according to the size of the pumpkin.