Peel apples, quarter them and cut out the core. Cut the flesh into cubes and sprinkle with lemon juice. Mix with 75 g sugar and 8 tablespoons water in a saucepan. Simmer covered for 8-10 minutes. Break biscuits roughly and divide them into 4 large glasses. Heat up the jam, stir in the sherry and drizzle on the sponge cake. Let stand at room temperature for about 1/2 hour.
In the meantime stir 100 ml milk and starch in a saucepan until smooth. Add 275 ml milk and 15 g sugar while stirring and bring to the boil. Whisk the egg yolks and 3 tablespoons of the sauce and add to the rest of the sauce with a whisk. Cook for another 1 minute while stirring continuously, remove from heat and add vanilla extract. Distribute the apple compote in portions in the glasses. Drizzle with vanilla sauce. Rest of sauce extra rich
20 minutes waiting time