A widget in the little etching in the bottom of the glass, it's purpose is to keep the bubbles going in a lager , cider ect. An Ale or real beer wont need one.
Some like John Smiths Extra Smooth has a floating widget built into the can.
Once again, you show that you are a creative, even tho' crazy, egger! Your food always makes me want to go out and fire up the egg. Even when I'm cooking on one of the other cookers!