Peel, core and grate the apples, mix with the sugar, cinnamon, lemon zest or juice, leave to stand for a moment.
In the meantime, mix the ingredients for the dough and knead well and roll out into two sheets the size of a baking sheet. Grease and flour the baking sheet, place the first sheet of dough on the sheet, sprinkle with some breadcrumbs or semolina (to soak up the excess liquid).
Put apples on the dough, if a lot of juice has formed, drain it off. Place the second sheet of dough on top, prick with a fork and bake at 200 ° on the middle rack for 35-45 minutes, should be the color of mixed bread.