London bun
A London bun is a square-shaped bun made of rich yeast dough flavored with currants and topped with white sugar icing.
Formerly a popular tea time bun it is now somewhat neglected. Its nearest still popular equivalent is the Bath bun. Neither should be confused with the Finger Bun, an elongated bun topped with white icing sugar, optionally with shredded or finely chopped coconut, and available with or without fruit.
The phrase "all talk and no London bun," believed to have originated in South Australia, is used to describe a person who doesn't follow through on their promises.
