- Preheat the oven to 180°C.
- Roll out the pastry and line a 23cm (9-inch) tart tin.
- Line with baking parchment and baking beans, then blind bake for 10 minutes.
- Remove the baking beans and parchment and set aside. Reduce the oven temperature to 160°C.
- Melt the dark chocolate in a heatproof bowl set over simmering water, or microwave in short bursts, stirring until smooth. Leave to cool slightly.
- Place the double cream, Merchant Gourmet Chestnut Purée and cinnamon in a saucepan.
- Warm gently for around 5 minutes, whisking until smooth. Do not allow the mixture to boil.
- In a separate bowl, whisk together the egg, egg yolks and caster sugar.
- Gradually whisk a few spoonfuls of the warm cream mixture into the eggs, then slowly add the remainder, whisking continuously.
- Stir through the melted chocolate and the pinch of salt.
- Pour the filling into the baked pastry case.
- Bake at 160°C for approximately 20 minutes, until just set with a slight wobble in the centre.
- Allow to cool completely, then chill for at least 4 hours or overnight.
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