🇮🇹 Italian · Dessert
🌰 Castagnaccio
Castagnaccio
A dense, naturally gluten-free Tuscan cake made entirely from chestnut flour, studded with pine nuts and raisins, and finished with fresh rosemary — a distinctly autumnal, unsweetened-tasting treat.
Castagnaccio has no added sugar beyond what the chestnut flour and raisins naturally contribute, resulting in a dense, earthy cake that reflects centuries of Tuscan mountain communities relying on chestnuts as a dietary staple during lean winters.
Ingredients
Equipment: Mixing bowl, Whisk, Round baking pan, about 26cm
- 400 g (3⅓ cups) chestnut flour
- 500 ml (2 cups) water, approximately
- Pinch of salt
- 80 ml (⅓ cup) extra virgin olive oil, plus more for the pan
- 50 g (⅓ cup) raisins, soaked in warm water
- 40 g (¼ cup) pine nuts
- 2 sprigs fresh rosemary
Method
- Whisk the chestnut flour, water, and salt together into a smooth, thin batter, similar to a crepe batter, working out any lumps.
- Whisk in most of the olive oil.
- Let the batter rest for 30 minutes.
- Generously oil a round baking pan and pour in the batter, spreading to an even layer about 1.5cm thick.
- Scatter the drained raisins and pine nuts evenly over the top, and tuck rosemary sprigs into the batter.
- Drizzle with the remaining olive oil.
- Bake at 200°C (400°F) for 30–35 minutes, until the top develops characteristic deep cracks and a dark, slightly crusty surface.
- Cool before slicing — castagnaccio is traditionally served at room temperature.
Chef Tips
- The deeply cracked, almost rustic-looking surface is entirely traditional and expected — don't worry if it looks quite different from a typical Western cake.
- This cake is naturally unsweetened and gluten-free by nature, not by substitution, given its chestnut flour base.
- Castagnaccio is best enjoyed the day it's made, though it keeps reasonably well for a couple of days.
Common Mistakes to Avoid
- Expecting a light, sweet cake — castagnaccio is dense and only mildly sweet, an acquired taste for some.
- Making the batter too thick, resulting in an overly dense, gummy texture rather than the traditional thin layer.
- Skipping the rosemary, which provides an essential aromatic contrast to the chestnut flavor.
Nutrition (per serving)
Health Benefits
- Chestnut flour is naturally gluten-free and provides fiber and complex carbohydrates.
Cultural Note
Castagnaccio has deep roots in Tuscany's mountainous Apennine communities, where chestnut flour was historically a dietary staple long before wheat became widely affordable.
Storage & Serving
Storage: Store covered at room temperature for up to 2 days.
Reheating: Not applicable; served at room temperature.
Serve with: Fresh ricotta, for a modern accompaniment, A glass of Vin Santo