Place the mousse and 1/4 litre of milk in a tall mixing bowl and stir briefly. Whisk with the whisks of the hand mixer for approx. 3 minutes at the highest setting until creamy and chill for at least 1 hour. In the meantime, stir the sauce powder and 2 tablespoons of milk until smooth. Bring the remaining milk and sugar to the boil, stir in the sauce powder. Bring to the boil and let cool while stirring.
Stir in advocaat. Coarsely chop the nuts. Use two tablespoons of the mousse to cut off the cams. Arrange two of each with some sauce on plates. Sprinkle with nuts and decorate with balm