Device for producing a frothed liquid comprising: - a chamber opened to atmosphere with a transverse bottom wall and a longitudinal upward wall, - at least one water inlet, - at least one liquid delivery outlet (20, 21) in the bottom wall, characterized in that: - the water inlet is provided through the upward wall and is dimensioned and oriented for directing a jet of water in the chamber, - the at least one liquid delivery outlet (20, 21) and the direction and the dimension of the water inlet are configured for enabling liquid to rise up along the side of the upward wall, - the device comprises means for controlling the delivered flow of liquid through the device so that liquid is prevented from too quickly leaving the chamber in order to be able to create a layer of liquid that rises up along the side of the upward wall that can be impacted by the jet of water, said control means being obtained by the total surface area of the liquid delivery outlet(s) (20, 21) being determined so that the evacuation flow rate by gravity of the liquid through the outlet(s) (20, 21) is lower than the filling flow rate of the chamber in water through the water inlet. - the water inlet is situated at or within the lower quarter of the chamber, - the water inlet is oriented along a direction inside the chamber which is offset relative to the longitudinal central axis of the chamber, the ratio "d/r" being comprised between 0.2 and 0.9, where "r" is the radius of the chamber and "d" is the distance measured orthogonally from the direction of orientation of the inlet to the central axis of the chamber, - the water inlet is inclined downwardly in direction of the bottom wall according to a certain angle (b) relative to the transversal plane of the chamber, said angle (b) being comprised between 5 and 30 degrees. - a chamber opened to atmosphere with a transverse bottom wall and a longitudinal upward wall, - at least one water inlet, - at least one liquid delivery outlet (20, 21) in the bottom wall, - the water inlet is provided through the upward wall and is dimensioned and oriented for directing a jet of water in the chamber, - the at least one liquid delivery outlet (20, 21) and the direction and the dimension of the water inlet are configured for enabling liquid to rise up along the side of the upward wall, - the device comprises means for controlling the delivered flow of liquid through the device so that liquid is prevented from too quickly leaving the chamber in order to be able to create a layer of liquid that rises up along the side of the upward wall that can be impacted by the jet of water, said control means being obtained by the total surface area of the liquid delivery outlet(s) (20, 21) being determined so that the evacuation flow rate by gravity of the liquid through the outlet(s) (20, 21) is lower than the filling flow rate of the chamber in water through the water inlet. - the water inlet is situated at or within the lower quarter of the chamber, - the water inlet is oriented along a direction inside the chamber which is offset relative to the longitudinal central axis of the chamber, the ratio "d/r" being comprised between 0.2 and 0.9, where "r" is the radius of the chamber and "d" is the distance measured orthogonally from the direction of orientation of the inlet to the central axis of the chamber, - the water inlet is inclined downwardly in direction of the bottom wall according to a certain angle (b) relative to the transversal plane of the chamber, said angle (b) being comprised between 5 and 30 degrees.