Start by making the shortcrust pastry.
Mix the flour and powdered sugar together.
Crumble the soft butter into the mixture with your hands until it becomes crumbly.
Add the egg and quickly gather the dough into a firm, soft dough.
Chill it in the fridge for 1 hour.
Then roll out the dough between two sheets of baking paper and place it in a tart pan or springform pan of 23-24 cm.
Prick holes in the dough and make the almond filling.
Mix butter, grated marzipan, and sugar together.
Add the egg and mix well.
Fold in the flour and pour the mixture over the tart dough.
Bake at 200 degrees Celsius (392 degrees Fahrenheit) for about 20 minutes until it is lightly golden.
Remove the tart and let it cool completely.
Melt dark chocolate or Nutella and spread it on the cake.
Chill the cake and prepare the cake cream following the package instructions.
Whip the cream and fold it into the cake cream.
Spread the cream on the cake or put it in a piping bag.
Decorate with halved strawberries or raspberries.
Optionally, sprinkle with powdered sugar.
Enjoy