Brewing unit for a food preparation machine

The invention concerns a brewing unit (3) having a cavity for enclosing a food ingredient contained in a package (C), comprising first (14) and second (15) cavity parts, and fluid injection means (13), characterized in that said first and second cavity parts (14, 15) are hinged in a pivotal arrangement between open and closed positions and in that, when said cavity parts are pivoted in a closed position, the fluid injection means (13) and/or the first cavity part (14) are movable in translation relative to the second cavity part (15), between:-a closed unlocked position that allows relative pivotal movement between cavity parts, and-a closed locked position wherein said cavity parts are translated in contact with each other to close said brewing cavity, and wherein said injection means (13) protrude inside the brewing cavity to pierce a wall of the portion package.