METHOD OF BREWING DARK BEER Russian patent published in 2010 - IPC C12C12/00 

FIELD: chemistry.

SUBSTANCE: invention relates to beer brewing technology. The method involves the following operations. Extracting hop with liquid nitrogen with separation of the corresponding miscella. Cutting, drying in a microwave field with given process parametres and roasting yacon. Mixing yacon and malt, impregnation of the obtained mixture with the separated miscella with simultaneous increase of pressure. Reducing pressure to atmospheric pressure level with simultaneous freezing of the mixture and cryogenic grinding in the medium of released nitrogen. Pouring drinking water and saccharification to obtain wort. Adding brewing yeast, primary fermentation, fortification, after fermentation and filtration.

EFFECT: invention shortens duration of the process and increases foam stability of the end product.