Bring ground almonds, 3/8 litres of milk, 50 g sugar, vanilla sugar and bitter almond baking oil to the boil in a saucepan. Stir cornflour and remaining milk until smooth. Then stir into the boiling milk and bring to the boil briefly.
Mix the egg yolks and some pudding, then stir into the rest of the pudding. Rinse 4 small moulds (approx. 100 ml content) with cold water and add the flummery. Put in a cool place for about 3 hours.
Defrost strawberries at room temperature. Add lemon juice and the remaining sugar and puree with the chopping stick. Roast the flaked almonds in a pan without fat until golden brown and let them cool down.
Turn the flummery onto plates, pour strawberry sauce over it and sprinkle with almond flakes. Dust with icing sugar and serve decorated with fresh strawberries as desired.