Preheat the oven
to 180C/350F. Mix the crushed ginger nuts and melted
butter. Press evenly over the base and side of a
23cm/9in pie plate. Bake for 6 minutes. Sprinkle the
gelatin over the water and leave to soften.
Beat the egg
yolks in a large mixing bowl and set aside. In a
saucepan, combine half the sugar, the corn-flour and
salt. Gradually stirring the milk. Boil for 1
minute, stirring constantly. Whisk the hot moil
mixture into the yolks, pour back into the saucepan
and return to the boil, whisking. Cook fro 1 minute,
still whisking. Remove from the heat.
Pour 225g/8oz of
the custard mixture into a bowl. Add the chopped
chocolate and stir until melted. Stir in half the
rum and pour into the pie crust. Whisk the softened
gelatin into the plain custard until dissolved, then
stir in the remaining rum. Set the pan in cold water
to reach room temperature.
Beat the egg
whites and cream of tartar until they peak stiffly.
Add the remaining sugar gradually, beating
thoroughly after each addition. Fold the custard
into the egg whites, then spoon over the chocolate
mixture in the pie crust. Chill until se, about 2
hours. Decorate with chocolate curls.