Abstract: The invention concerns a process for the preparation of an edible plastified fat-containing product wherein a fat-containing composition is passed through a heat-exchanger comprising two closely spaced mutually displaceable surfaces, each having a pattern of cavities which overlap during movement of one surface with respect to the other, between which surfaces the composition passes, at least one of which surfaces is provided with means to control the temperature thereof, wherein more in particular one or both of the surfaces can act as heat exchanging surface. The surface(s) can either be heated or cooled.