Method for extracting an open cartridge (1) containing ground roasted coffee, the said cartridge (1) comprising an upper face provided with a circular bead (5) and a lower face provided with a filter, into which a mixture of water and air under pressure is injected by an injection member (7), surrounded by a sealing surface (10), which pierces the upper face of the cartridge, sealing during extraction being provided by the compression of the circular bead (5) of the cartridge against the sealing surface (10) surrounding the injection member (7), the mixture of water and air being injected, inside the cartridge (1), a few millimetres below the upper face of the latter and in an upward direction. …IMAGE…
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