- Preheat the oven to 200°C fan.
- Melt the plant-based butter in a large deep frying pan or saucepan over a medium heat.
- Add the leeks and cook until starting to soften.
- Stir in the vegetable stock paste and mix well.
- Add the flour and stir until the leeks are evenly coated.
- Gradually pour in the water, stirring continuously, until a smooth sauce forms.
- Cook for a few minutes until the sauce begins to thicken.
- Stir through the asparagus, Dijon mustard, peas and Merchant Gourmet Whole Chestnuts.
- Season with salt and black pepper and cook for 2–3 minutes.
- Spoon the filling into a deep pie dish.
- Lay the puff pastry over the top and trim or crimp the edges if needed.
- Bake for approximately 25 minutes, or until the pastry is golden, crisp and cooked through.
- Leave to stand for a few minutes before serving.
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