This recipe was made by Antonella, my daughter in law, and I thought it would be a great one to share, especially since she swears it's infallible. Sweet and delicate apples are not appropriate for this dessert, so choose tart ones. The blackberries are Antonella's addition, and they give this apple pie a wonderful flavor and bright color, but this step is completely optional, or you can substitute with other berries, such as raspberries, if that is what you have in the fridge. Big scoops of ice cream are a must!