Preheat the oven to 170 °C (convection oven).
Preheat the oven to 170 °C (convection oven).
For the sponge base: whisk the eggs with the sugar until fluffy. Mix the flour with the cocoa powder and salt and fold into the egg mixture.
Spread the dough onto a baking tray lined with baking paper and bake in the preheated oven for approx. 8-10 minutes.