METHOD FOR PRODUCING OF GRASS TEA Russian patent published in 2006 - IPC A23F3/34 

FIELD: food-processing industry, in particular, production of grass tea compositions.

SUBSTANCE: method involves treating mixture of dog rose fruits and hibiscus flowers with flow of non-polar gas such as nitrous oxide or argon at above-critical temperature and pressure parameters, said gas circulating through closed circuit at velocity rate exceeding hydraulic size of mixture particles for 25-30 min. Thereafter, flow temperature is reduced to value below critical temperature value, with the result that earlier desorbed particles are absorbed by mixture particles. Pressure is then reduced to atmospheric pressure value. Resultant grass tea is brewed faster by at least 2 times.

EFFECT: improved quality and more homogeneous composition of grass tea.