1. Fill your glass halfway with Narragansett Lager.
2. Top with your favorite nitro stout from either tap or can.
3. Wait for the stout to settle on the top.
As nitrogen is lighter than CO2, the stout with the nitrogen will float on top. The trick is that you need to pour the stout over the back of a spoon so that it doesn’t fall to the bottom of the glass and mix directly with the Narragansett Lager.