- Preheat the oven to 180°C.
- Melt the butter in a large frying pan over a medium heat.
- Add the celeriac and leeks and cook for 5 minutes until beginning to soften.
- Stir through the thyme and garlic and cook for a further 5 minutes over a low heat.
- Add the Merchant Gourmet Whole Chestnuts, then stir through the flour and cook for 1 minute.
- Pour in the vegetable stock and simmer for 15–20 minutes until the celeriac is tender.
- Stir through the soft cheese, mustard and grated Cheddar. Season well and remove from the heat.
- Transfer the filling to an ovenproof baking dish.
- Roughly scrunch the filo pastry and scatter over the top of the filling to create a light, uneven layer.
- Drizzle with the olive oil.
- Bake for 15 minutes until the pastry is crisp and golden.
- Serve with green vegetables.
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