Knead the dough ingredients into a dough and shape it into a ball. Wrap these in cling film and let them rest in the refrigerator for 30 minutes. Then roll it out on a floured work surface (approx. 45 - 50 cm) and cut into 8 pieces of cake.
Peel and core the apple and cut into 8 wedges. Place each column on a piece of dough and roll the dough into a croissant, then press the corners on the sides to form a packet.
Then place the individual parcels side by side in a baking dish with the seam facing down so that there is little space between them (approx. 1 cm). The casserole dish should have a slightly higher edge if possible, as the dough pieces expand and thus nothing overflows.
Melt the butter in a small saucepan, then add sugar, cane sugar, cinnamon and vanilla sugar and heat everything well, but do not let it boil. Let the sugar melt for a few minutes and then pour everything over the apple turnovers.
Finally, carefully pour the lemon soda around the dough pieces along the edge of the baking dish. It then runs a little under the already filled mass, but should not mix completely with it. Therefore do not pour over the dough pieces.
Place the casserole dish in the preheated oven at 175 degrees top / bottom heat on the middle rack and bake the apples in the batter for about 40 minutes.