Preheat the oven to 350 degrees F. Move the rack to the middle.
Roll out the larger piece of dough into a circle to fit a 22 cm tart pan or spring form pan about 1/2 cm thick. Carefully move to the pan and trim.Roll out the second piece the same thickness and cut 8 strips of dough.
Prick the prepared dough in the pan with a fork. Pour in the filling. Add 4 strips of dough, spaced across the top, end to end. Place the remaining 4 strips of dough across the top to create diamonds. Pinch the dough where the strips meet the sides of the pan.
Carefully place the pastiera in the oven and bake for 30 minutes. Turn the pan halfway and bake an additional 15-30 minutes or until golden brown and not giggly when the pan is moved gentaly.
Turn off the oven, open the door partially and let cool.
Best after 1-3 days to let the flavours meld.