A process of preparing a beverage from a beverage preparation chamber includes the steps of feeding water to the preparation chamber (2) until a first pressure (P1) of at least 3 bar is reached, interrupting the flow of water to the preparation chamber, holding said preparation chamber (2) in a closed condition for a first time interval (t1), opening said outlet (3) of the preparation chamber (2) and delivering the thus prepared beverage whereas the pressure is decreased at least once during said time interval (t1).
