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Seirass is a boundary entry, set by heat and acid, not by microbes. Fresh whey is heated to at most 70 °C, 5–15% whole milk is added, and at up to 85 °C citric acid, vinegar or a herb mix (Bouna) makes the proteins rise; the ricotta is cooked on to 90–95 °C to dry it. It hangs in a cloth, may be pressed, is salted and aged at least 21 days, then wrapped in dried mountain hay that stays green.
Total time across the recorded steps: 22 days – 3 months
Start
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What changes:Whole milk is stirred into the warm whey at no more than 70 °C
Step 1 of 6
Heat the whey and add milk
Time
Not documented
Temperature
up to 70 °C
Reported
Salt
None given
Acidity
Not documented
Which microbes the steps name, step by step
Moulds
Flavour
Not documented
Texture
Not documented
Colour
Not documented
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
At a glance
Seirass is a boundary entry, set by heat and acid, not by microbes. Fresh whey is heated to at most 70 °C, 5–15% whole milk is added, and at up to 85 °C citric acid, vinegar or a herb mix (Bouna) makes the proteins rise; the ricotta is cooked on to 90–95 °C to dry it. It hangs in a cloth, may be pressed, is salted and aged at least 21 days, then wrapped in dried mountain hay that stays green. Made in 6 steps over 22 days – 3 months. The longest step, age, takes 21 days – 3 months (Regione Piemonte 2015).
The regional sheet rates it of medium-high safety because of the strong heat treatment, up to 90–95 °C. It names the drying time and the moisture left in the finished cheese as the difficulties, and says the Festuca hay must be gathered, cleaned and dried with care.
The regional sheet traces "saras" to 1267–68 records of the Chatel-Argent fief and to Pantaleone da Confienza's 1477 treatise, and cites the 1883 Jacini agrarian inquiry. The name comes from serum, whey, and the hay wrapping gave "del fèn".