Which beer is classified as an Imperial Stout?

North Coast Old Rasputin is classified as an Imperial Stout due to its high alcohol content and rich, complex flavor profile. Imperial Stouts typically have an alcohol by volume (ABV) of over 8%, which allows them to exhibit deeper flavors and aromas that include chocolate, coffee, and dark fruits. Old Rasputin, in particular, is known for its boldness and robust character, showcasing rich maltiness and a balanced bitterness from the hops used.

In contrast, Mikkeller Porter and 10 Barrel American Stout do not achieve the higher alcohol content or the intense flavor depth that characterizes Imperial Stouts. Additionally, Brewdog Libertine is categorized as a stout but does not fit within the Imperial designation either. Thus, the distinction of North Coast Old Rasputin as an Imperial Stout showcases its alignment with the key characteristics defining this beer style, particularly its potency and flavor intensity.