Pfannkuchen

The Pfannkuchen was a doughnut shop in Hamburg, Germany visited by the Fifth Doctor and Nyssa in the 1950s. According to Nyssa, reading the sign translated into English by the TARDIS translation circuit, the name came from the German word of doughnut. (AUDIO: 1963: Fanfare for the Common Men)

Behind the scenes
This is actually untrue. Literally, the word Pfannkuchen means pancake, and is used as such in the majority of Germany, including Hamburg. It is only in select German locations like Berlin that Pfannkuchen is used to mean anything close to doughnut, and even then it's only.