Preheat the oven to 180 °C (convection oven).
Preheat the oven to 180 °C (convection oven).
For the sponge base: Whisk the egg whites with the sugar and salt until stiff.
Fold in the egg yolks. Sift in the flour mix well.
Line a baking sheet with baking paper and pour the mixture approx. 1 cm deep onto the baking tray.
Bake for approx. 10 minutes in the hot oven.
For the apple filling: whisk the QimiQ Classic smooth. Add the sugar, lemon juice and grated apple, mix well and chill.