Cold Sponge Cake For Schnitten

Preheat the oven to 400 °F (200 °C).
Cream the egg yolks with the confectioner’s sugar, vanilla sugar, salt, and lemon zest.
Beat the egg whites slightly, add the granulated sugar, and beat to stiff peaks.
Fold the two mixtures together, but not completely.
Sift in the flour and carefully fold in.
Line a baking sheet with parchment paper and spread out the batter on it.
Bake for about 10 minutes.
After baking, overturn onto parchment paper sprinkled with granulated sugar and carefully pull the parchment paper from the cake.

Ingredients