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Preheat the oven
to 180°C/350°F/Gas mark 4.
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To make the pastry,
sift the flour, cocoa, sugar and salt into a
mixing bowl and make a well in the centre. Put
the butter and egg yolk in the well and knead
together, then gradually mix in the dry
ingredients.
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Knead lightly into a ball. Cover
with Clingfilm and chill in the refrigerator for
1 hour. Unwrap the dough and roll it out on a
lightly floured surface. Use it to line a
25cm/10in non-stick spring form pie tin and prick
the base with a fork.
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Line the pastry case with
aluminum foil and fill with baking beans. Bake
in the oven for 15 minutes. Remove from the
oven, discard the beans and foil, and allow to
cool. Leave the oven on.
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Roughly chop 225g/8oz
pecan nuts. Mix the butter with 50g/2oz demerara
sugar. Beat in the eggs one at a time, then add
the remaining demerara sugar and mix. Stir in
the double cream, flour and chopped pecan nuts.
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Melt the chocolate in a heatproof bowl set over
a pan of simmering water, then add to the
mixture. Spoon the filling into the
pastry case and smooth the surface. Cut the
remaining pecan nuts in half and arrange over
the pie.
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Bake in the oven for 30 minutes, then cover the
top of the pie with aluminum foil to prevent it
from burning and bake for a further 25 minutes.
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Remove the pie from the oven and let it cool
slightly before removing from the tin and
transferring to a wire rack to cool completely.
Dust with the icing sugar.