First, make your pastry" target="_blank">http://www.jamieoliver.com/recipes/dessert-recipes/old_fashioned_sweet_shortcrust_pastry">pastry
dough, wrap it in clingfilm and rest it in the fridge for at least half an
hour. Then preheat the oven to 180°C/350°F/gas 4. Put the butter and sugar into
a saucepan and, when the butter has melted, add the apples, stem ginger and a
tablespoon of the ginger syrup. Slowly cook for 15 minutes with a lid on, then
add the blackberries, stir and cook for 5 more minutes with the lid
off.
Meanwhile, remove your pastry from the fridge. Dust your work
surface with flour, cut the pastry in half and, using a floured rolling pin,
roll one of the pieces out until it’s just under 1cm thick. (Rolling the dough
between two layers of greaseproof paper will also stop it sticking to your
rolling pin.) Butter a shallow 26cm pie dish and line with the pastry, trimming
off any excess round the edges using a sharp knife.
Tip the cooled apples
and blackberries into a sieve, reserving all the juices, then put the fruit into
the lined pie dish so you have a mound in the middle. Spoon over half the
reserved juices. Brush the edge of the pastry with beaten egg. Roll out the
second piece of pastry, just as you did the first, and lay it over the top of
the pie. Trim the edges as before and crimp them together with your fingers.
Brush the top of the pie with the rest of the beaten egg, sprinkle generously
with sugar and the cinnamon, and make a couple of slashes in the top of the
pastry.
Place the pie on a baking tray and then put it directly on the
bottom of the preheated oven for 55 to 60 minutes, until golden brown and crisp.
To serve, slice the pie into portions and serve with a generous dollop of
custard.