Mushroom, Chestnut & Thyme Pithivier
A showstopping vegetarian pithivier – golden, domed puff pastry filled with a rich, earthy mixture of mushrooms, chestnuts and thyme, brought together with a touch of crème fraîche. The air fryer delivers an exceptionally crisp, lacquered pastry top that's hard to achieve in a conventional oven. Elegant enough for a dinner party, surprisingly straightforward to make.
Ingredients
Method
- Cook down the mushrooms: Heat 30 grams of unsalted butter and 1 tablespoon of olive oil in a large frying pan over medium-high heat. Add 3 shallots, finely diced and cook for 14 minutes until soft and translucent. Add 3 garlic cloves, minced and cook for a further minute. Add 300 grams of chestnut mushrooms, finely chopped and 150 grams of portobello mushrooms, finely chopped, season well with 1 pinch of salt and black pepper, and cook for 8–10 minutes, stirring occasionally. The mushrooms must lose almost all their moisture – don't rush this step, as a wet filling will make the pastry soggy.
- Add chestnuts, herbs and wine: Pour in 2 tablespoons dry sherry or white wine and let it bubble and evaporate for 1–2 minutes. Add 150 grams cooked chestnuts, roughly chopped, and 2 teaspoons fresh thyme leaves, stir well, and cook for a further 2 minutes until everything is fragrant and combined. Remove from the heat.
- Finish the filling: Stir in 3 tablespoons crème fraîche and taste for seasoning – the filling should be rich, well-seasoned and cohesive. Spread the mixture onto a plate or tray and leave to cool completely, either at room temperature for 20 minutes or in the fridge for 10 minutes. Do not assemble with a warm filling.
- Cut the pastry circles: Unroll both sheets of 2 ready-rolled all-butter puff pastry sheets on a lightly floured surface. Using a 20cm plate or cake tin as a guide, cut one circle per sheet – giving you a base and a lid. The lid circle can be very slightly larger (22cm) to allow for the dome of filling. Place both on a lined tray and refrigerate while the filling finishes cooling.
- Assemble the pithivier: Place the base pastry circle on a sheet of baking paper cut to fit your air fryer basket. If using, spread a thin layer of 1 teaspoon of Dijon mustard (optional, for base) over the centre, leaving a 3cm border clear. Spoon the cooled filling into the centre and shape it into a neat, domed mound – keeping well within the border. Brush the exposed border with 1 egg, beaten (egg wash). Lay the top pastry circle over the filling, pressing firmly around the edges to seal. Crimp the edges with a fork or pinch between your fingers to create a decorative border.
- Egg wash and score: Brush the entire top surface evenly with 1 egg, beaten (egg wash) – be thorough but avoid letting it drip down the sides, which can prevent the pastry from rising. Using a sharp knife, score a curved spiral or petal pattern radiating from the centre, cutting just through the top layer of pastry without going all the way through. Make a small steam hole in the very centre with the tip of your knife. Refrigerate for 15 minutes – this is what gives you clean, defined scoring lines
- Bake in the air fryer – 22–25 min: Preheat your air fryer to 180 °C for 23 minutes. Carefully lower the pithivier (on its baking paper) into the basket. Bake for 22–25 minutes until the pastry is a deep, even golden brown and feels crisp and firm when lightly tapped. Check at 18 minutes – if the top is colouring too quickly, lay a small piece of foil loosely over it for the final few minutes.
- Make the quick jus: While the pithivier bakes, bring 200 millilitres vegetable stock to a simmer in a small pan with 1 teaspoons soy sauce. Reduce by half over medium heat – about 6–8 minutes. Remove from heat and whisk in 15 grams cold unsalted butter, for jus for a glossy finish. Season with 1 pinch salt and black pepper to taste. Keep warm on the lowest heat.
- Rest: Remove the pithivier from the air fryer and leave to rest for 8 minutes before cutting. The filling will be very hot and needs time to settle – this also makes for much cleaner slices.
- Slice and serve: Using a sharp, serrated knife, cut the pithivier into wedges at the table for maximum effect. Spoon the warm jus around each portion and serve immediately.
Notes
Mushroom moisture is everything: The single most important step is cooking the mushrooms until completely dry. Any residual liquid will steam the pastry base from the inside. If in doubt, cook them for a couple of extra minutes.
Pastry tip: All-butter puff pastry (Jus-Rol or similar) gives the best flavour and rise. Keep it cold until the last possible moment – warm pastry is harder to work with and won’t puff as dramatically.
Scoring tip: A pithivier traditionally has a curved petal or feathered pattern. Chill the assembled pie before scoring for the cleanest lines. A cocktail stick or skewer works well for the central steam hole.
Make ahead: The filling can be made up to 2 days in advance and kept covered in the fridge. The assembled, uncooked pithivier can be frozen for up to 1 month – bake from frozen at 175 °C for 30–35 minutes.
Chestnut note: Vacuum-packed cooked chestnuts (e.g. Merchant Gourmet) work perfectly here — no need to roast your own. Roughly chop for texture rather than blitzing smooth.
Jus upgrade: Add a splash of Madeira or port to the jus for extra depth, or stir through a teaspoon of redcurrant jelly.
