Beverage preparation machine

A method for preparing a beverage with a beverage preparation machine, the beverage preparation machine comprising at least one nozzle connected to a liquid supplying system, the at least one nozzle comprising a tube, the tube comprising a liquid inlet and a liquid outlet, wherein the at least one nozzle further comprises a sleeve, the sleeve presenting an internal section greater than an internal section of the liquid outlet of the tube, and the sleeve surrounding the liquid outlet of the tube, and wherein the sleeve comprises at least one opening in a lateral wall of the sleeve, the opening being positioned near the liquid outlet end of the tube, the method comprising:

• introducing a beverage ingredient in a container in the beverage preparation machine;
• introducing at least one jet of liquid into the container through the liquid outlet of the at least one nozzle, wherein the sleeve surrounds the at least one the jet of liquid emerging from the liquid outlet;
• and
• sucking air through the at least one opening into the sleeve such that the air in the sleeve is flowing in the sleeve around the at least one jet of liquid, wherein the at least one jet of liquid enters inside the beverage in preparation, carrying along air bubbles in the beverage and producing foaming.