Formaggio di Fossa is one of the most unusual and ancient cheese-ageing techniques in Italy — cheese (typically a blend of cow's and sheep's milk, or pure sheep's milk pecorino) buried in tufa rock pits (fosse) in the hillside town of Sogliano al Rubicone, on the border of Romagna and the Marche, and left to age underground for three months. The technique dates to at least the 14th century, when burying cheese in pits was a method of hiding food from marauding armies and tax collectors. The pits are carved into the local tufa (volcanic sandstone) and lined with straw, with cheeses wrapped in cloth and stacked inside. The pits are sealed, and the cheeses undergo an anaerobic fermentation and ageing process that fundamentally transforms them: the natural bacteria and moulds in the pit, the humidity, the temperature (which remains constant underground), and the absence of oxygen create conditions that produce a cheese unlike anything aged in conventional cellars. After three months, the pits are opened in a public ceremony in November (the Fossa Cheese Festival in Sogliano), and the cheeses are extracted — misshapen from the weight of stacking, pungent, crumbly, with an intense, complex flavour that ranges from sharp and ammoniacal to sweet and truffle-like depending on the original cheese, the position in the pit, and the specific pit's microflora. The cheese holds DOP status as Formaggio di Fossa di Sogliano. Its flavour is not for beginners — it is strong, assertive, and deeply funky — but for those who appreciate complex cheese, it is a revelation. In Emilia-Romagna, it is grated over pasta (particularly passatelli) or eaten in chunks with honey.
Start with young (2-3 month) cow's milk, sheep's milk, or mixed cheese wheels|Wrap each cheese in cloth (linen or cotton) for protection|Lower into tufa-carved pits lined with clean straw — the pits are 3-4 metres deep|Stack the cheeses, layered with straw between each layer|Seal the pit mouth — the cheese ages anaerobically for approximately 90 days|The pit's natural bacteria, temperature (constant ~12-15°C), and humidity create unique ageing conditions|Open pits in November — traditionally the feast of Santa Caterina (November 25)|Extract cheese: it will be misshapen, pungent, and transformed|Trim any excess mould, serve in chunks or grate over pasta
The best formaggio di fossa has a balance between the sharpness of the anaerobic ageing and a residual sweetness from the original cheese — when this balance is right, the flavour is extraordinary, with truffle and mushroom notes that emerge from the pit's natural microflora. Paired with acacia honey, the sharp-sweet contrast is magnificent. Grated over passatelli in brodo, it adds an intensity that Parmigiano-Reggiano alone cannot provide. The November festival in Sogliano is worth attending — the opening of the pits and the first tasting of the season's cheese is a genuine culinary event. The DOP requires cheese to be buried in pits within the designated area of Sogliano al Rubicone and nearby Talamello — any cheese buried elsewhere is not the real thing.
Expecting a mild, approachable cheese — fossa cheese is intense and pungent; it is an acquired taste. Using it where a milder cheese is needed — its strong flavour overwhelms delicate dishes. Storing it like fresh cheese — it keeps well wrapped in paper at cool temperature for weeks. Not understanding the terroir dimension — different pits produce different results; the specific microflora of each pit is unique.
Consorzio Formaggio di Fossa di Sogliano DOP; Accademia Italiana della Cucina — Romagna/Marche volumes