For the Mozart balls, cut the nougat mixture into 1.5 x 1.5 cubes, shape into balls and refrigerate.
Stir the marzipan mixture until smooth and incorporate the pistachios. Knead in confectioners’ sugar and shape mixture into a roll. Cut into as many slices as there are nougat balls.
Flatten marzipan slices, place nougat balls on top and coat with marzipan mixture.
Melt the couverture in a water bath and dip the Mozart balls in it.