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To make the pastry, sift the flour and cocoa powder into
a mixing bowl. Rub in the butter until the mixture
resembles fine breadcrumbs. Stir in the sugar and enough
cold water to mix to a soft dough. Chill for 15 minutes.
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Preheat the oven to 190°C/375°F/Gas mark 5. Roll out
the pastry dough on a lightly floured surface and use to
line a 23cm/9in loose-bottomed flan tin. Line with
aluminum foil and baking beans. Bake blind in the oven
for 15 minutes. Remove the beans and foil and cook for a
further 10 minutes, until crisp.
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To make the filling,
beat the butter and sugar in a bowl and gradually beat
in the eggs with the cocoa powder. Beat in the melted
chocolate with the single cream and the dissolved cocoa
powder.
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Pour the mixture into the cooked pastry case
and bake at 170°C/325°F/Gas mark 3 for 45 minutes or
until the filling is set.
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Leave to cool completely
then transfer to a serving plate. Cover with the whipped
cream and leave to chill.