Pimm's Cup
The Pimm's Cup is really just one of the preferred ways to drink a particular distilled spirit, and so the drink took on the brand name. That liqueur is Pimm's No. 1, a gin-based spirit with the flavor of fruit and spice. Adding a mixer as subtle as lemonade enhances its character and turns it into a refreshing summer drink that has long been a favorite in the U.K. (read more about the history of Pimm's and find a traditional recipe).
Ginger ale or lemon-lime soda are occasionally used to replace the lemonade and at other times, club soda is added to the original recipe.