Step 1 – Preparing the cake layers:
- Separate egg whites from egg yolks
- Wipe the mixing bowl with a piece of lemon to remove any traces of fat, then dry it thoroughly with a paper towel.
- Add salt and vanilla sugar to the egg whites, and beat them on low speed until foam forms.
- Then, add the sugar in two additions.
- Increase the mixer speed and beat until stiff peaks form.
- One minute before the end of beating, add lemon juice.
- On a baking sheet lined with parchment paper, use an 8-inch ring to shape 3 cake layers about 0.5 inches high.
- To make it easier to remove the ring, lightly spray the inside with water.
- Place the remaining meringue into a piping bag with a star tip and pipe small and medium-sized meringue dollops for decorating the cake later.
- Bake at 90°C (195°F) for 2 hours.
- Then remove the small meringues and bake for 30 more minutes.
- Meringues can only be removed from the baking sheet after they have cooled.
Step 2 – Charlotte Custard Cream:
- In a saucepan, combine the milk, half of the sugar, salt, and vanilla sugar.
- Bring to a boil, stirring occasionally.
- Rub the egg yolks with the remaining sugar until smooth.
- When the milk comes to a boil, remove it from the heat and gradually pour it into the yolk mixture, whisking constantly.
- Return the milk mixture to the heat and cook until thickened. Do not heat it above 80 degrees Celsius.
- Strain the custard, cover with plastic wrap directly on the surface, and let it cool to 20°C (68°F).
- Beat the room temperature butter until it turns pale.
- Gradually add the cooled custard mixture and beat until smooth.
- The temperature of the custard and the butter should be roughly the same when combining, to prevent the cream from curdling.
Step 3 – Assembly:
- Toast the nuts in the oven at 150°C (302°F) for 10 minutes.
- Place the first cake layer on a cake board, spread cream over it, and sprinkle with nuts.
- Place the second layer on top, right side up.
- Spread with cream and sprinkle with nuts again.
- Place the third layer on top, and use the remaining cream to smooth out the surface of the cake.
- Use good meringue pieces to decorate the top of the cake.
- Break the remaining meringue and use it to decorate the sides.
- Meringue cake is sensitive to moisture, so it should be kept isolated in the refrigerator. You can use plastic wrap or place it in a plastic container.