Whisk the egg whites to stiff peaks, gradually adding 50 g of the sugar.
Once the foam is completely stiff, add the remaining 130 g sugar and the 10 egg yolks.
Remove the whisk and gently fold in the plain flour and rice flour with a wooden spoon.
Divide the batter into four equal parts: mix grated chocolate into one, red food coloring into another, leaving the other two plain.
Bake the four batters separately into thin layers, about 10-12 minutes per layer at 180°C.
Let the baked layers rest for a day before assembling the cake.
For the filling, rub the sugar cubes over the lemon and orange zest, add the fruit juice and the softened gelatine, and boil into a syrup.
Once cool, add the rum and the crumbled sponge cake until you get a thick cream.
Layer the cake with this cream to assemble it.
For the icing, rub the sugar over the orange zest, cook with water into a syrup, remove from heat, add rum and enough icing sugar to thicken it, and tint it pale pink with a few drops of red food coloring.
Coat the cake with this icing.
Based on: Malatinszky Fanny szakácskönyve (a classic Hungarian cookbook), modernised. Calories and protein are estimated.