The Guinness Nitrosurge device lets stout drinkers enjoy a pint of the black stuff that isn’t dissimilar from how it’s served in a pub. However, the specific Nitrosurge cans can be expensive to buy.

The Guinness widget is a tiny, plastic ball inside beer cans. During canning, pressurized nitrogen is added to the brew, which trickles into a hole in the widget. Once opened, the widget's ...