Separate eggs. Set aside the egg white. Bring cream and sugar to the boil and remove from the heat. Stir in the egg yolk with a whisk. Heat the mixture while stirring (with a dough scraper along the bottom) at low heat for about 5 minutes until it becomes thick and creamy. DO NOT LET IT BOIL!
Cover the cream directly on the surface with cling film and let it cool down. Whisk the egg white with the whisk of the hand mixer until stiff, adding icing sugar. Fold in ground almonds. Line the bottom of a springform pan (26 cm Ø) with baking paper. Pour in the mixture and smooth it down. Bake in the preheated oven (electric: 175 °C/ gas: level 2) for about 25 minutes. Leave to cool in the mould. Roast the flaked almonds in a pan without fat until golden brown. Let them cool down. Stir butter until creamy. Add the egg cream by the spoonful. Remove the base from the mould and place on a plate.
Leave to cool in the mould. Roast the flaked almonds in a pan without fat until golden brown. Let them cool down. Stir butter until creamy. Add the egg cream by the spoonful. Remove the base from the mould and place on a plate. Spread the egg custard on the surface. Sprinkle with almonds and icing sugar
Waiting time approx. 1 hour