The invention proposes a dosing device (1) for the preparation of a food composition comprising supply means (2) for providing a soluble powder, a dosing member (3) which is rotatably mounted and which comprises at least one recessed portion (4) for receiving powder supplied by the supply means (2) in a first rotational position and discharging powder in a second rotational position, and tapping means (5) driven by the rotation of the dosing member (3) and designed to induce a reciprocating force on the supply means (2).