The invention proposes a system comprising a beverage preparation device (10) and a capsule (1) for preparing a beverage from a food substance contained in a compartment (2) of the capsule by injection of a liquid into the capsule, the beverage preparation device (10) having opening means (3) which are designed to interact with a wall member (4) provided at an outlet face (6b) of the capsule (1), wherein the opening means (3) comprise an opening member (7) having a hook-like shape designed to shear and move away at least a portion of a cover (11) sealed to the outlet face (6b) of the capsule.