This Sardinian cheese is a cheese with a difference; it’s riddled with insect larvae. “Casu Marzu” means ‘rotten cheese’ and is most commonly referred to as ‘maggot cheese.’ It’s now banned for health reasons but can still be available on the black market in Sardinia and Italy.
The sheep’s milk cheese is basically Pecorino, which has had the larvae of the cheese fly, Piophila casei, introduced to it. Fermentation occurs as the larvae digest the cheese fats, and the texture becomes very soft with some liquid seeping out. The cheese has to be eaten when the maggots are still alive because when they are dead it is considered to be toxic.
Since the larvae can jump if they are disturbed, diners have to shield their eyes or place the cheese in a sealed paper bag until the maggots are starved of oxygen and die. Health issues have arisen in relation to Casu Marzu, including reports of allergic reactions and the danger of consuming cheese that has advanced to a toxic state. There’s also some risk of intestinal larval infection.