Heat up the oven (electric cooker: 160 °C/gas: level 3) Grease two cake tins (approx. 23 cm Ø) with butter and line them with baking paper.
Sieve flour, salt and baking powder into a large bowl.
Whisk butter and sugar until fluffy. Add the vanilla flavouring and, stirring, gradually add the egg yolk. Stir in half the milk. Add half of the flour mixture and mix well.
Add the remaining milk and flour in the same way.
Beat the egg whites until soft tips form. 1⁄3 Stir the beaten egg whites into the cake mixture. Fold in the rest, but do not allow too much air to escape.
Spread the dough over the moulds and bake the cakes for 45-50 minutes until a wooden stick you prick in remains clean. Let the cakes cool for 10 minutes before taking them out of the moulds.
Let it cool down on a cake rack.
For the buttercream glazes, pass the fruit purees. Whip 1 part butter and 1 part icing sugar until frothy. Add a fruit puree. Lemon juice or vanilla flavour can balance the taste.
Cut the cakes in half horizontally and place one of the bases on a cake plate. Spread it with a butter cream. Place all the cakes on top of each other. The top layer looks very good with a buttercream glaze running down.
Cover the cake with fresh fruit.