Separate the egg whites from the yolks. Mix the egg whites with the salt powder and the added sugar spoon by spoon, until it is no longer felt. do not leave. Meanwhile, clean the apples and cut them into small cubes.
Add them to the dough and mix with a spoon. Line a pan with oil and flour and turn the dough over. Bake the cake until it becomes copper. Let it cool completely, then powder with powdered sugar.