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Pasteurised, standardised Orkney cow milk is ripened 60 minutes at 31 °C with a Lactococcus and Streptococcus thermophilus culture, then set with rennet in about 25 minutes. The curd is cut, cooked to 40 °C and pitched onto a finishing table, where it is stirred without stopping (dry stirring) until it is salted 3 h 15 min to 3 h 25 min after renneting. The salted curd forms 20 kg blocks that are vacuum-bagged and matured 6–18 months at 8–10 °C.
Lactococcus lactis subsp. cremoris/lactis and Streptococcus thermophilus
Total time across the recorded steps: 6 months – 18 months
Start
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What changes:The milk is pasteurised and skimmed to a set fat level
Step 1 of 8
Pasteurise and standardise the milk
Time
Not documented
Temperature
Not documented
Salt
None given
Acidity
Not documented
Which microbes the steps name, step by step
Lactococcus lactis
Streptococcus salivarius
The milk is pasteurised and cream is removed with a centrifugal separator to hold a set butterfat to protein ratio all year.
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
Pasteurised, standardised Orkney cow milk is ripened 60 minutes at 31 °C with a Lactococcus and Streptococcus thermophilus culture, then set with rennet in about 25 minutes. The curd is cut, cooked to 40 °C and pitched onto a finishing table, where it is stirred without stopping (dry stirring) until it is salted 3 h 15 min to 3 h 25 min after renneting. The salted curd forms 20 kg blocks that are vacuum-bagged and matured 6–18 months at 8–10 °C. Made in 8 steps over 6 months – 18 months. The longest step, bag and mature, takes 6–18 months (UK Department for Environment 2006) and runs at 8–10 °C (UK Department for Environment 2006). Salt is 1.6–2.1 % (European Commission 2012). Lactococcus lactis subsp. cremoris and subsp. lactis and Streptococcus salivarius subsp. thermophilus do most of the fermenting.
It uses a dry-stir method developed in 1984 instead of slab cheddaring; the curd is stirred continuously on the table until salting, so it never forms slabs, and only knits together in the block towers.
Ages
Medium 6–12 months, Mature 12–15 months, Extra Mature 15–18 months
Composition
Moisture 33–36%, fat 33–36%, fat in dry matter 50–52%, salt 1.6–2.1%
The first creamery opened in Kirkwall in 1946 after wartime milk supply rose to feed some 60 000 service personnel; a new creamery switched to a cheddar recipe in 1958, and dry stirring was adopted in 1984.