How to Choose a Coffee Machine For Pods The pod machines read the barcode on the top of the pod (which is actually an un-sealed disc of pre-dosed ground coffee compressed between two layers of filter paper). You just insert it and push a button. Pop in an espresso pod https://coffeee-uk57600.dbblog.net/1586362/the-10-most-terrifying-things-about-pods-coffee-machine