A beverage cartridge is provided for use in forming a beverage in a beverage machine that provides a pressurized liquid. The cartridge includes a container having an interior space; a rim; a lid attached to the rim and closing the opening of the container, wherein the lid accommodates an inflow of the pressurized liquid; a membrane disposed within the interior space and defining a first chamber and a second chamber within the interior space, wherein the membrane is configured to selectively isolate the first and second chamber; a fluid stored within the second chamber wherein the fluid is arranged to interact with the pressurized liquid introduced into the container to form the beverage; and a filter disposed within the first chamber, wherein the filter is arranged to contain a first beverage medium arranged to interact with the pressurized liquid introduced into the container to form the beverage.