A machine including: a housing a cylindrical-shaped processing tub that extends into the housing cooling means adapted to cool the processing tub a mixing member rotatably mounted within the processing tub, with the mixing member being structured so as to mix ingredients in the processing tub and so as to scrape at least the inner side surface of the processing tub to prevent the ingredients from adhering to the side wall of the tub and a containing collar which is dimensioned so as to be fitted in a releasable manner in the processing tub above the mixing member.
