Article content It’s a new take on brain freeze as breweries, including three cool spots in London, Sarnia, and Windsor, seize on serving adult versions of slushies made with fruity hard seltzers or sour beers or both for a decidedly different way to refresh on a blisteringly hot summer’s day. We apologize, but this video has failed to load. Try refreshing your browser. Brews News: Beer slushies add to summer refresher options Back to video Imperial City in Sarnia introduced beer and hard seltzer slushies on July 23 with sales starting only on the patio or in the taproom. They’ll soon be available packaged for taking home.