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Preheat the oven
to 160°C/325°F/Gas mark 3. Place the digestive
biscuits in a plastic bag and crush with a
rolling pin. Pour into a mixing bowl.
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Stir the
butter into the biscuit crumbs until well mixed.
Press the biscuit mixture firmly into the base
and up the sides of a 23cm/9in flan tin or dish.
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To make the filling, beat the egg yolks, sugar
and corn flour in a large bowl until they form a
smooth paste, adding a little of the milk if
necessary.
-
Heat the milk until almost boiling,
then slowly pour into the egg mixture, whisking
well. Return the mixture to the saucepan and
cook gently, whisking constantly, until it
thickens. Remove from the heat.
-
Melt the
chocolate in a heatproof bowl set over a pan of
simmering water. Then whisk the melted chocolate
into the mixture in the saucepan. Pour the
mixture into the digestive biscuit base.
-
To make
the meringue, whisk the egg whites in a large
mixing bowl until standing in soft peaks.
-
Gradually whisk in about two thirds of the sugar
until the mixture is thick and glossy. Fold in
the remaining sugar and the vanilla essence.
-
Spread the meringue over the filling. Bake in
the centre of the oven for 30
minutes. Serve warm.