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Italian, Tuscan cuisineDessert

Castagnaccio

Castagnaccio is Tuscany’s rustic chestnut-flour cake: chestnut flour and water form a thin batter enriched with olive oil, raisins, pine nuts, walnuts and rosemary. The classic cake needs no added sugar because good chestnut flour supplies its own sweetness.

Castagnaccio: wide hero view of the finished traditional dish
15 minutesPrep
30 minutesCook
55 minutesTotal
8 servingsYield

About Castagnaccio

Visit Tuscany describes the oldest form as chestnut flour, water, extra-virgin olive oil and rosemary, with raisins, pine nuts and walnuts among established additions.

The batter is thinner than ordinary cake batter and is baked in a shallow layer, which creates the characteristic dense, tender texture.

No wheat flour, eggs or chemical leavening are needed.

The surface is ready when it looks dry and develops fine cracks around nuts and rosemary.

Technique

Three things that matter

  • Sift chestnut flour. Chestnut flour clumps easily; gradual water and whisking create a smooth batter.
  • Bake shallow. A deep pan turns castagnaccio heavy and pasty before the surface sets.
  • Trust chestnut sweetness. Traditional castagnaccio does not require added sugar.

Ingredients

Recipe card

Castagnaccio

Yield8
Preparation: 15 mCooking: 30 mTotal time: 55 m

Cake

Equipment

Mixing bowl for batter
Whisk for lump-free chestnut batter
26 cm shallow round baking pan for the traditional thin layer
Fine sieve for chestnut flour

Method

Mix the batter

01Soak the raisins.

Cover raisins with warm water for 10 minutes, then drain and pat dry.

Raisins should be plump without dripping water.

02Whisk flour and water.

Combine chestnut flour and salt, then add water gradually while whisking.

The batter should be smooth, pourable and free of dry lumps.

03Add part of the garnish.

Stir in half the raisins, pine nuts and walnuts with 1 tablespoon olive oil.

The inclusions should stay suspended throughout the batter.

Prepare the pan

04Heat the oven.

Preheat to 180°C and oil a shallow 26 cm pan generously.

The oil should coat the base and lower sides in a visible film.

05Pour shallowly.

Pour the batter into the pan and level it.

The layer should be relatively thin, roughly 1–1.5 cm.

06Top traditionally.

Scatter remaining raisins, pine nuts, walnuts and rosemary, then drizzle with the remaining olive oil.

Toppings should be distributed rather than piled in the centre.

Bake and cool

07Bake until cracked.

Bake 25–30 minutes.

The top should be dry and marked by fine cracks while the centre remains dense and tender.

08Rest in the pan.

Cool 10 minutes before cutting.

The cake should firm enough to lift without becoming dry.

09Serve warm or cool.

Cut into wedges and serve warm or at room temperature.

Chestnut, rosemary and olive oil should remain clearly identifiable.

Practical guidance

Practical guidance

Chestnut flour

Use fresh, sweet-smelling flour. Rancid chestnut flour tastes bitter and cannot be rescued by added sugar.

Gluten

The ingredient list is naturally gluten-free, but anyone with coeliac disease should verify certified gluten-free flour and contamination controls.

Texture

Castagnaccio is intentionally dense and moist rather than aerated like a conventional cake.

Troubleshooting

Troubleshooting

  • Batter is lumpy. Water was added too quickly. Whisk in stages or pass the batter through a sieve.
  • Cake is gummy. The layer was too deep or baking was too short. Use a wide shallow pan.
  • Cake tastes bitter. The chestnut flour may be old, or rosemary was overused. Start with high-quality flour.
Nutrition per serving

Nutrition per serving

  • Serving size: 1/8 cake
  • Calories: approximately 250 kcal
  • Carbohydrates: 38 g
  • Protein: 4 g
  • Fat: 10 g
  • Fibre: 4 g
  • Sodium: 80 mg

Naturally sweet chestnut flour is the main carbohydrate source; no sugar is added.

Allergens and food safety

Allergens and food safety

Contains tree nuts.

Verify chestnut flour is fresh and stored properly.

For a gluten-free claim, use certified gluten-free ingredients and prevent cross-contact.

FAQ

FAQ

Does castagnaccio contain sugar?

A classic Tuscan formulation does not need added sugar; chestnut flour provides natural sweetness.

Why is rosemary used in a dessert?

Rosemary is a traditional aromatic pairing with chestnut flour and olive oil in castagnaccio.

Is it supposed to rise?

No. It is a dense, shallow, unleavened chestnut cake.

Final note

What matters most

  • Result: A thin, dense chestnut cake with a softly cracked surface, sweet raisins, toasted nuts, rosemary and fruity olive oil.
  • Key: Use fresh chestnut flour, whisk a smooth pourable batter and bake it in a shallow layer.
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