The invention relates to a mixing paddle (100) that is designed to rotate about a horizontal rotation axis and comprises at least one eccentric arm (110, 120) which comprises: - a first portion inclined with respect to a plane containing the rotation axis (150), so as to cause the ingredients contained in the mixing chamber to move in a first axial direction when the mixing paddle (100) rotates in a first direction of rotation, - a second portion having a cross section oriented radially with respect to the rotation axis (150) in order, when the mixing paddle (100) rotates in a second direction of rotation, to bring about a radial movement of the ingredients towards the outside of the mixing chamber.
