File'e ferru refers to the best known Sardinian distilled drink.

It is made from selected marcs. "File'e ferru" (distilled white spirit) is a typical drink from Oristano and the inland villages.

At the turn of the century, the "File'e Ferru" was subject to heavy taxation and in order to avoid paying the producers often buried it to hide it from the tax men. The name "file'e ferru" derives from the piece of iron wire which was used to indicate where the spirit had been buried.