Kaisermelange

Although it is nowadays rarely found in Viennese coffee houses, Kaisermelange is often listed as a unique Viennese specialty. It consists of a pulled espresso that is mixed with a raw egg yolk. The beverage is usually sweetened with honey and fortified with Cognac, other types of brandy, or rum.

The name Kaisermelange translates as Emperor's mélange—presumably because of the luscious texture and rich flavor of the coffee, which makes it worthy of being served to an emperor.