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

FIELD: chemistry.

SUBSTANCE: invention relates to brewing technology. Method involves mixing kumquat peel and hop, extraction of the obtained mixture with liquid nitrogen and separation of the corresponding miscella. Yacon is then cut, dried in a microwave field with given process parametres and roasted. The yacon is then mixed with malt. The obtained mixture is saturated with the separated miscella, while simultaneously raising pressure. Pressure is lowered to atmospheric level and the mixture is simultaneously frozen. The mixture then undergoes cryogenic grinding in the medium of the released nitrogen. Water is added and saccharification is carried out to obtain wort. Brewing yeast is added and primary fermentation, after-fermentation and filtration are carried out to obtain the end product.

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