If you ever wanted a way to dessert up your beer, or just plain keeping it colder for longer, Japanese beer maker Kirin has got the item for you. Presenting: Frozen beer foam in the vein of soft serve ice cream that sits atop a beer, keeping it cool.
In order to make the topping, Kirin freezes their Ichiban Shibori Frozen Draft beer to 23 degrees Fahrenheit while air is blown into it. Simple as that. When the frozen foam topping is placed on the beer, it acts as something of a lid, keeping the beer cold for thirty minutes. Due to the nature of the topping, when the foam eventually does melt into the beer, it doesn’t dilute the taste, but provides a somewhat creamier flavor to the overall beverage.
Japanese Company Tops Drinks With Soft Serve Frozen Beer Foam [Geekosystem]