Mix the pudding powder, sugar and approx. 200 ml cold milk in a bowl until smooth. Bring the remaining milk to the boil in a saucepan, remove from the heat and stir in the pudding powder. Put it back on the hot stove and boil it for at least 1 minute while stirring. Put the hot pudding in a bowl and cover directly on the surface with foil. Allow to cool. Dice the Viennese cake base, place in a bowl and sprinkle with rum. Cover and leave to stand.
Turn in between. Whip cream until stiff. Mix the cold pudding with the whisk of the hand mixer until creamy, then fold in the cream with a dough scraper. Layer the cream alternately with the rum biscuit cubes in a large glass bowl and sprinkle with grated chocolate. Decorate with a cocktail cherry and mint. Keep cool until serving