Place a
baking sheet in the oven and preheat to
180'C/350'F /Gas 4. Mix the biscuits and butter
together and press over the base and sides of a
23cm/9in pie plate. Bake for 8 minutes.
Grate the chocolate in
a blender or food processor. Place the milk
in the top of a double boiler. Sprinkle over
the gelatin and leave for 5 minutes to
soften.
In the top of a
double boiler, put 40g/1 1/2oz/6 tbsp sugar, the
chocolate and egg yolks. Stir until dissolved. Add
the vanilla. Place the top in a bowl of ice and stir
until the mixture reaches room temperature. Remove
from the ice.
Beat the egg
whites and salt until they peak softly. Add the
remaining sugar and beat just to blend. Fold a
dollop of egg whites into the chocolate mixture,
then pour back into the whites and fold in.
Fold in the
cream and pour into the pie crust. Freeze until
just set, about 5 minutes, then chill for 3-4
hours. Decorate with whipped cream and chocolate
curls.