To make the second fermentable, peel the apples and pour lemon juice on them so that they are not blackened. In the same bowl, put sour cream, 3 eggs, 150 g. Sugar, vanilla, half a lemon zest and half an orange zest. Mix with a mixer and then mix with 3 tablespoons of flour. Roll out the finished dough, wrap it in parchment paper. Put the sliced apples on top, sprinkle with orange zest and pour sour cream. Bake at 170 degrees 45 minutes.