Clean, wash and cut the rhubarb into pieces. Bring apple juice to the boil, steam rhubarb for about 5 minutes. Stir in sugar. Stir pudding powder and 3 tablespoons of water until smooth, thicken rhubarb with it, bring to the boil again. Pour into a bowl and let cool off. Whip the cream until stiff and allow vanilla sugar to trickle in.
Halve the cream. Stir under half a cup of cocoa and 2 tablespoons of chocolate sprinkles. Fill rhubarb compote into glasses. Pour chocolate cream and cream on top. Sprinkle with 1 tablespoon of grated chocolate. Decorate with amarettini and lemon balm leaves
1 hour waiting time