Sift the flour with the baking powder into a bowl and mix in the semolina with a pinch of salt. Separate the eggs, beat the egg whites until stiff.
Now stir the butter, egg yolks, vanilla sugar and 1/3 of the sugar in a second bowl until frothy. Now mix in the semolina / flour mixture alternately with the egg whites. Then stir in the orange juice and the grated orange peel.
Grease a springform pan with a diameter of 28 cm, fill in the dough and bake in a preheated oven at 175 ° for about 50 - 60 minutes.
In the meantime, boil the remaining sugar with 1/8 liter of water and the lemon juice and soak the finished cake with it.