the present invention relates to a method for preparing a beverage such as espresso coffee , which consists in feeding pressurized hot water through a coffee powder tablet ; blocking , downstream of the tablet , the extracted liquid that has passed through the tablet ; producing a removable plug by the use of the extracted liquid ; causing an increase in pressure downstream of the tablet to increase the hot water pressurization inside the tablet ; and reaching a removal pressure adapted to remove the removable plug , with subsequent dispensing of the extracted liquid at a dispensing pressure that is lower than the removal pressure to cause a decompression of the hot water inside the tablet .