Ingredients
White chocolate ganache
Method
1.Preheat the oven to moderately slow (160°C/140°C fan-forced). Grease a deep 22cm-square cake pan; line base with baking paper.
2.Combine butter, chocolate, sugar, milk and vanilla paste in a medium saucepan; whisk over low heat until smooth. Transfer mixture to a large bowl; cool for 15 minutes.
3.Gradually whisk in egg and sifted flours; pour mixture into prepared pan. Bake 1 hour 20 minutes; cool cake in pan.
4.Meanwhile, make white chocolate ganache. Bring cream to the boil in a small saucepan; pour over chocolate in a medium heatproof bowl, stir until smooth. Cover; refrigerate, stirring occasionally, about 30 minutes or until spreadable.
5.Turn cake, top-side up, onto serving plate. Spread ganache all over cake.