Wash, halve and stone the plums. Bring apple juice, 3 tablespoons sugar and vanilla pod to the boil. Add the plums and simmer for about 5 minutes. Add liqueur. Stir the sauce powder with 2 tablespoons of water until smooth, bind the plums with it, simmer again for about 1 minute.
Pour into a bowl and allow to cool. Separate eggs. Whip egg yolks, 2 tablespoons sugar, milk and salt until creamy. Gradually stir in the flour and almonds. Beat egg whites until stiff and fold in carefully.
Heat 1 tablespoon of clarified butter in 2 pans (24 cm Ø each). Sprinkle in almond flakes. Put 1/2 of the dough into each pan and fry one side on low to medium heat until golden brown, turn.
Divide into large pieces with the help of 2 forks, also fry until golden brown. Dust the Kaiserschmarrn with icing sugar and arrange on plates with compote. Decorate with melissa.