Instructions
Step 1: Meringue Preparation and Drying (Day 1)
Dried Egg Whites: Beat the aged egg whites with a pinch of salt until stiff peaks form. Gradually beat in the granulated and vanilla sugar until a glossy, stiff meringue is formed.
Gently fold the chopped nuts and flour into the meringue using a spatula.
Divide the mixture into two equal circles (approx. 22-24 cm in diameter) on a baking sheet lined with parchment paper.
Dry in the oven at 100 °C (212 °F) with the door slightly ajar (or using the convection function) for 12-14 hours. The layers must be completely dry and crispy. Let them cool.
Step 2: Preparing the Cream Base (Day 2)
In a saucepan, mix the egg yolks, milk, and sugar. Cook over low heat until the mixture thickens (like custard), stirring constantly to prevent the yolks from curdling. Do not boil!
Let the finished mixture cool completely to room temperature. This is the base for the Charlotte cream.
Step 3: Finishing the Buttercream
In a bowl, beat the room temperature butter until light and fluffy. This takes about 5 minutes.
Gradually beat the cooled cream base and condensed milk and vanilla extract into the butter mixture, one spoonful at a time.
Transfer about a third of the cream to another bowl and mix in the cocoa powder (for decoration).
Step 4: Assembling the Cake
Place the first meringue layer on a serving plate. Spread a thick layer of the light buttercream over it.
Cover with the second meringue layer. Frost the sides of the cake with the remaining light cream. Use the dark (cocoa) cream to decorate the surface and edges.
Decorate with chopped nuts and/or chocolate shavings.
Step 5: Chilling and Serving
Place the cake in the refrigerator for a minimum of 2 hours to allow the cream to set and the cake to stabilize.
Before slicing, let it sit at room temperature for a while. Serve.