brouwerij: Picobrouwerij Alvinne

bierstijl: Sour Beer/American Wild Ale, donker

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Sigma is a 10.0% dark sour ale.  It pours a murky dark brown, with a lively head that quickly disappears completely.  The aroma is typical of a sour ale, strongly acidic, with a little funkiness in the background.

The flavour is somewhat like a Flanders Oud Bruin, with a strong, sharp acidity which grips the sides of the tongue early.   Tartness of green apples and a prickly carbonation make for a lively mouthfeel.  There is subdued dark malt, which softens the puckering somewhat.  The finish is very dry, sucking the moisture from the mouth, with a lingering tartness.  As for the alcohol, you’d never know it was 10%!

The Morpheus yeast: Unusually for a microbrewery, Alvinne has cultured its own unique yeast strain – Morpheus – which it uses in many beers; including the sour series.  Developed by the third member of the brewery team who has a Masters in Food Science Engineering, Marc de Keukeleire is known as ‘the Yeast Whisperer’!