1. Mix in the flower, salt and cold butter until it turns into a sandy dough. Add the vinegar and gradually the cold water. Incorporating until the dough becomes homogeneous and elastic. Leave it in the refrigerator for about 30 minutes and then spread it into thin layers. Cut the layers at the dimension desired for the pie.
2. Mix the eggs with the sugar and vanilla sugar and incorporate the cottage cheese and yoghurt gradually.
3. In a rectangular tray, place special baking paper and put 3-4 pie sheets one on top of the other, after lubricating them with melted butter. Poor into them the filling of yoghurt and cheese and cover with other 3-4 sheets lubricated with melted butter. Put the tray into the oven heated 45 minutes before, medium temperature. Serve warm.