A system for the preparation of a liquid product comprises a disposable cartridge filled with a single serve portion of a liquid ingredient to be combined with a base liquid for the preparation of a liquid product. Further the system comprises a dispensing apparatus with a pressurized gas source, wherein the apparatus is adapted to bring said pressurized gas source in direct communication with the reservoir of the disposable cartridge so as to allow said liquid ingredient therein to be pressurized by said gas thereby assisting the dispensing thereof from the reservoir via said one or more dispensing passages. The system is adapted to create one or more openings in said portion of the sealing film that covers the reservoir. The dispensing apparatus further comprises a pressurization dome member having a peripheral gas seal adapted to sealingly engage the disposable cartridge around a location where said one or more openings are created in said sealing film and the pressurized gas source is connected to said dome member and is adapted to feed pressurized gas beneath said dome member within the contour of the peripheral gas seal sealingly engaging the disposable cartridge, so as to allow said liquid ingredient in said reservoir to be pressurized by said gas via the one or more openings in said sealing film, thereby assisting the dispensing of the liquid ingredient from the reservoir via said one or more dispensing passages.