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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.
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Stir in the sugar
and enough cold water to mix to a soft dough.
Chill for 15 minutes. Preheat the oven to
190°C/375°F/Gas mark 5.
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Roll out the pastry
dough on a lightly floured surface and use to
line a greased 23cm/9in loose-bottomed flan tin.
Line with aluminum foil and baking beans.
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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. Melt the
dark chocolate in a heatproof bowl set over a
pan of simmering water.
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Then beat the melted
chocolate into the mixture in the other bowl
with the single cream and the chocolate essence.
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.