A Gibraltar is a cortado. The name comes from the glass.
The origin
Blue Bottle Coffee in San Francisco served small milk drinks in a Libbey Gibraltar tumbler — a stackable 4.5-ounce rocks glass. Staff began calling the drink by the glass, customers picked it up, and the name spread across American specialty cafés.
It is one of the few drinks named after its vessel rather than its contents or its origin.
What is in it
A double ristretto with roughly 60 ml of textured milk, in a 130 ml glass. Espresso-forward, minimal foam.
Functionally identical to a Spanish cortado, and if you order a cortado in a café that says Gibraltar you will get the same thing.
Why the name persists
Partly habit, partly identity — using it signalled familiarity with a particular corner of American coffee culture.
Its usefulness is fading as cortado has become widely understood in the US.
Making one
Pull a double ristretto — 18 g in, 27 g out — into a small glass. Texture 60 ml of whole milk with almost no stretch and a long spin. Pour close to the surface.
Latte art is possible in the small volume and difficult.