Flies' graveyard and flies' cemetery are nicknames used in various parts of the United Kingdom for sweet pastries filled with currants or raisins, which are the "flies" in the "graveyard" or "cemetery". In Scotland, the formal name is fruit slice or fruit squares. In Northern Ireland, the formal term is currant squares. In the North East of England, they are called fly cakes or fly pie.
The mixture is similar to sweet mince pies, which are traditionally eaten at Christmas time in the United Kingdom.