A Gibraltar is similar to a cortado, but with a double shot of espresso. It gets its name from being served in Gibraltar Rocks glass – not related to the Rock of Gibraltar, but to alcoholic drinks served “on the rocks”, and is the registered name for what is called in many bars, a whisky tumbler. It does not have much history, dating back to just 2005 in San Francisco when local cafes started serving an extra-shot cortado in a Gibraltar glass.