Preheat the oven to 170 ° C (top / bottom heat). Beat the eggs until creamy. Add the buttermilk and season with xucker and lemon. Now add the remaining ingredients and mix everything together well.
Line a baking sheet with parchment paper and distribute the mixture on top. Smooth out the dough and place in the oven for 15 minutes. Then let the base cool down a bit.
For the filling, whip the cream until stiff, then carefully stir in the cream cheese and xucker. Heat the frozen berries in the microwave and press them flat with a spoon or puree with the blender. Possibly sweeten.
Brush the bottom with the cream, then with the berries and roll up. Place in the refrigerator for at least an hour.