The invention relates to a method for preparing a beverage through a capsule (2) inserted in a beverage machine; the capsule (2) comprising an enclosure (20) containing one or more beverage ingredients, wherein a brewing fluid is introduced in the enclosure (20) to brew said one or more beverage ingredients, characterized in that: a discharge wall (3, 3B, 300, 310, 320, 330) is placed in association with the enclosure (20), wherein the discharge wall (3, 300, 310, 320, 330) comprises discharge means (100, 301, 311, 321, 331) which restrain the brewed liquid from being discharged from the capsule (2) or limit the liquid flow in case the pressure inside the enclosure (20) is below a predetermined value, and the discharge means (100, 301, 311, 321, 331) enable the delivery of the brewed liquid in case the pressure exceeds said predetermined value.