Preheat the oven to 170 °C (convection oven).
Preheat the oven to 170 °C (convection oven).
For the sponge base: whisk the eggs, sugar and salt until stiff peaks form. Fold in the flour and cocoa powder carefully. Quickly add the oil and mix well. Spread the dough onto a baking tray lined with baking paper and bake in the preheated oven for approx. 8- 10 minutes.
For the filling: lightly whisk the chilled QimiQ Whip with the sugar until completely smooth, ensuring that the entire mixture is incorporated (especially from bottom and sides of bowl).
Add the quark, wild berry puree and lemon juice and whip until the required volume has been achieved. Lastly quickly fold in the melted chocolate.
Spread the filling onto the sponge and roll into a roulade. Allow to chill for approx. 4-6 hours.
Tip: Decorate with fresh berries.