The present invention relates to a cartridge (1) containing one or more beverage ingredients and comprising an inlet (27) for the introduction of an aqueous medium and an outlet (43) for the beverage produced from the one or more beverage ingredients, the cartridge incorporating within a beverage flow path between the inlet (27) and the outlet (43) an eductor for entraining air into the beverage, the eductor comprising an aperture (128) for producing a jet of the beverage, means for producing a pressure reduction of the jet of beverage, at least one air inlet (71), and a deflecting channel (80) downstream of the aperture (128), the cartridge further comprising a circulation chamber (93) between the deflecting channel (80) of the eductor and the outlet (43), the deflecting channel entering the circulation chamber (93) from a periphery of said circulation chamber and the outlet of the cartridge being located at or near a centre of said circulation chamber, wherein the circulation chamber (93) is shaped to cause the beverage exiting the deflecting channel (80) of the eductor to whirl around the circulation chamber (93) before exiting the outlet (43).
