System for preparing beverage consumptions comprising a beverage preparation device, and at least one exchangeable supply pack. The beverage preparation device comprises a mixing chamber having a beverage outlet, liquid supply means including a liquid flow path for supplying a liquid to the mixing chamber; air supply means for supplying air to the liquid flow path, and a drive shaft. The at least one exchangeable supply pack includes a container for holding a beverage related ingredient, and a doser arranged for supplying the beverage related ingredient in a dosed manner. The exchangeable pack and the device are mechanically connectable. When connected the doser is in fluid communication with the mixing chamber and the drive shaft is arranged for transmitting torque to the doser, such that when activated, beverage related ingredient is supplied from the outlet of the doser into the mixing chamber.