-
Grease and flour a 23 cm/9 in deep round cake
tin (pan). Break up half the plain chocolate and
place in a bowl over a pan of hot water. Stir until
melted. (Or melt briefly in the microwave.)
-
Beat
together the butter and icing sugar until fluffy.
Beat in the melted chocolate, then the egg yolks.
Sift the flour and corn flour over the surface and
fold in with a metal spoon.
-
Whisk the egg whites
until stiff. Beat a little into the chocolate
mixture to soften it, then very lightly fold in the
remainder with a metal spoon.
-
Turn into the prepared
tin and bake in a preheated oven at
150°C/300°F/gas mark 2 for 50 minutes or until
risen and firm. Leave to cool in the tin for 10
minutes, then turn out on to a wire rack to cool
completely.
-
When cold, split in half horizontally
and sandwich together with half the jam. Leave on
the wire rack. Spread the remaining jam over the top
and sides of the cake.
-
Put the water and caster
sugar in a saucepan and stir well. Heat without
stirring until the sugar has melted. Bring to the
boil and boil until the mixture reaches the soft
ball stage, when 5 ml/1 tsp of the mixture dropped
into cold water forms a soft ball, or until it
reaches 115°C/240°F on a sugar thermometer.
-
Remove
from the heat and immediately plunge the base of the
pan briefly in cold water to prevent further
cooking. Melt the remaining plain chocolate in a
bowl over a pan of hot water.
-
Beat in the still-hot
syrup. Beat thoroughly until the mixture has a
smooth coating consistency. Pour over the cake and
use a palette knife to spread it evenly. Work
quickly before the mixture sets. Leave until firm.
-
Melt the white chocolate in a bowl over a pan of hot
water. Spoon into a small paper piping bag and snip
off the very tip of the bag. Pipe the word
Sachertorte on top and allow to set before
serving.