Roast nut flakes in a pan without fat until golden brown. Whip the cream with the whisk of the hand mixer, slowly add the vanillin sugar and egg liqueur and whip again briefly.
Chill the sauce. Coarsely chop the couverture and melt in a water bath. Arrange some sauce and a scoop of ice cream on four dessert plates. Carefully run the melted chocolate coating over the ice cream scoops and sprinkle them with nut flakes.
Serve as desired, decorated with mint and chocolate flakes. Serve the rest of the sauce separately.