Mix the eggs, the sugar (1) and the almond powder until light and airy.
Melt the butter.
Beat the egg whites and add the sugar (2).
Mix the melted butter with the almond powder and add the flour.
Spread onto a baking tray (make sure the mixture is no more than 1 cm thick).
Bake at 210°C for 10 minutes.
After baking, immediately remove the sponge cake from the baking tray and leave to cool.