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Ewe milk, raw in spring and pasteurised the rest of the year, is set with lamb or calf rennet at 38 °C. The curd is broken and stirred at 42 °C, moulded, soaked for 2–3 hours in hot whey to drain, dry-salted for two days and ripened for 6–12 months. Some wheels are smoked over straw or finished in grape pomace. Made in 9 steps over 6.1 months – 12 months. The longest step, ripen on wooden boards, takes 6–12 months (ARSIAL (Lazio regional agency for agricultura…). Lactic acid bacteria from the raw milk, the dairy and the ripening rooms, which the sheet says the raw-milk make is meant to keep and Lactococcus lactis, Lactiplantibacillus plantarum and Latilactobacillus curvatus, found in Pecorino di Picinisco, a raw-milk ewe cheese of the same province do most of the fermenting.
Starter: none for raw milk; thermophilic cultures at 38 °C for pasteurised milk
Total time across the recorded steps: 6.1 months – 12 months
Start
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What changes:Starting material: ewe milk from up to four milkings, kept cold for two days
Step 1 of 9
Chill the milk
Time
2 days
Set
Temperature
4–6 °C
Set
Salt
None given
Acidity
Not documented
Which microbes the steps name, step by step
Lactic acid bacteria
Lactococcus lactis
L. plantarum
L. curvatus
Output: raw or pasteurised ewe milk.
Flavour
Not documented
Texture
Not documented
Colour
white
Microbes at work in this step
Not documented for this step.
Method
Measured measured in a studySet fixed by a specification or tested recipeReported one source reports itTypical a general value, not sourced for this fermentUnconfirmed not yet checked against a source
What makes this one different
The milk stays raw only in the spring pasture months, and the moulded cheeses drain for 2–3 hours in whey at 60 °C. Some wheels are finished with a short straw smoke or a month in grape pomace.
Milk
Whole ewe milk; raw from March to May, pasteurised from June to February
Alla vinacciaFinished about a month in grape pomace in September and October.
Safety
Spring cheese is made from raw milk. In a challenge study, E. coli O157 added to raw ewe milk was still detectable in pecorino after 90 days of ripening, so clean milk matters. The regional sheet notes that, as a PAT product, it may use the hygiene derogations allowed for traditional foods.
Hazards the sources name: Escherichia coli O157 in raw ewe milk; in a challenge study it was still detectable in pecorino after 90 days of ripening.
Ferentino, on the old Via Casilina, has kept sheep since pre-Roman times on well-watered pastures. The cheese has its own festival on the first Sunday of June.