If you are thinking of increasing the doses for 4 people, in order to obtain a low castagnaccio, it will be sufficient to equip yourself with a pan with a wider diameter, thus maintaining a height of about 1.5 cm.
Once the cake has been taken out of the oven, it can be seasoned again with a little raw oil if it has absorbed it completely during cooking. It can also be enjoyed warm, accompanied by a little buffalo ricotta, also seasoned with a few drops of extra virgin olive oil.
Castagnaccio, the rare times in which it is not finished immediately, is also good at room temperature and will stay fresh for even more than 3 days.
Enjoy your meal!