Assertion: beer | /r/CapableOf | sour as a result of fermenting
Facets:
value: naturally
type: MANNER
Source sentences:
text: Formerly, it was blended with beer that soured naturally as a result of fermenting in ancient oak tuns with a Brettanomyces population; it is now made with pasteurized beer that has been soured bacterially.  
text: Formerly, it was blended with beer that soured naturally as a result of fermenting in ancient oak tuns with a population; it is now made with pasteurized beer that has been soured bacterially.