1. Use the ready-rolled pastry to line a 23cm/9in flan or quiche tin. Fold the edges to give a decorative effect and prick the base several times with a fork, then chill for 20 minutes.
2. Preheat the oven to 200C/400F/gas mark 6. Line the pastry case with the paper from the pastry and fill with baking beans. Cook towards the top of the oven for 15 minutes then remove the beans and cook for a further 10 minutes or until the base pastry is lightly browned. Remove from the oven and reduce the temperature to 180C/350F/gas mark 4.
3. Sprinkle the dried fruit and chestnuts in the pastry case. Whisk the eggs, cream, sugar and orange zest together and pour into the pastry case.
4. Cook in the centre of the oven for about 30 minutes until set. Serve just warm with a dollop of crème fraíche or ice cream.