Melted butter, to grease
200g butter, cubed
200g white chocolate, chopped
200g (1 cup, firmly packed) dark brown sugar
180ml (3/4 cup) hot water
1 tablespoon golden syrup
2 teaspoons vanilla essence
2 eggs, at room temperature
150g (1 cup) plain flour
150g (1 cup) self-raising flour
Icing sugar, to dust

Preheat oven to 160°C. Brush a round 22cm (base measurement) cake pan with melted butter. Line base and side with non-stick baking paper.
Place butter, chocolate, sugar, water, golden syrup and vanilla essence in a heavy-based saucepan. Stir over medium-low heat with a wooden spoon for 5 mins or until chocolate melts and mixture is smooth. Set aside for 20 mins to cool.
Add eggs, 1 at a time, beating well after each addition. Sift combined flours over chocolate mixture and stir with a wooden spoon until well combined.
Pour mixture into pan and bake in preheated oven for 50-60 mins or until a skewer comes out almost clean. Stand cake for 20 mins before turning onto a wire rack to cool. Dust with icing sugar.