Pressure cooker to cook chestnuts: pour a small amount of cooking oil into the pressure cooker, heating for half a minute, pouring into the chestnuts washed well controlled dry, cover the lid, do not add a pneumatic valve, while heating, and then pick up the shaking, so that it is heated uniformly until you hear the sound of cracking, turn off the fire, and then open the lid. Shake it again, wait for the popping sound to stop, open the lid can be.