Oil, for greasing
275 g/10 oz plain (semi-sweet) chocolate
150 g/5 oz unsalted (sweet) butter
150 g/5 oz icing (confectioners') sugar, sifted
5 eggs, separated
150 g/5 oz self-raising (self-rising) flour
25 g/1 oz cornflour (cornstarch)
90 ml/6 tbsp apricot jam (conserve),
150 ml water
100 g/4 oz caster (superfine) sugar
25 g/1 oz white chocolate
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
cornflour 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
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.