Castagnaccio Toscano

Castagnaccio requires exactly four ingredients to be authentic: chestnut flour, water, olive oil, and salt. Everything else, the pine nuts, the rosemary, the raisins, these are adornments. Delicious adornments, but not essential. What is essential is that you understand this is not a sweet cake in the American sense. There is no sugar. The chestnuts provide a gentle, earthy sweetness that modern palates, trained on excessive sugar, may find subtle. This is correct.

The batter is thin. Alarmingly thin. You will think you have done something wrong. You have not. Castagnaccio should be no more than three-quarters of an inch thick when baked, often less. It should crack on top, those fissures a sign of proper texture, not failure. The surface should glisten with olive oil.

Tuscan mountain families made this when wheat was dear and chestnuts fell free from the trees. They called chestnut trees 'l'albero del pane,' the bread tree, because the flour sustained entire villages through winter. Do not add sugar to this cake. Do not substitute butter for olive oil. Do not make it thick and cakey. You would be erasing the history of people who created something profound from almost nothing.