Mix the flour, sugar, semolina, vanilla sugar and baking powder well. Coarsely grate the apples and butter.
Line a 26 cm springform pan with baking paper and layer 1/3 dry mix, then half of the apples, then 1/3 dry mix again, the rest of the apples and then the rest of the dry mix. Finally, pour the coarsely grated and frozen butter over it, bake the cake at 200 degrees for 60 minutes and, if possible, let it cool in the oven for a while.
Vanilla ice cream and whipped cream go perfectly with it, especially if the cake is still a little warm.