A full recipe for this dish has not been written yet.
History
A Sardinian pecorino left to the fly Piophila casei, whose larvae digest the fat; EU hygiene rules bar its sale, so it circulates informally.
Frequently asked questions
What is Casu marzu?
Casu marzu is a cheese & dairy from Italy: sardinian sheep cheese deliberately colonised by live cheese-fly larvae. A Sardinian pecorino left to the fly Piophila casei, whose larvae digest the fat; EU hygiene rules bar its sale, so it circulates informally.




