Mochaccino marbled mud cake

Ingredients

• 100 grams dark eating (semi-sweet) chocolate
• 125 grams butter
• 1 cup (220g) caster (superfine) sugar
• 2/3 cup (160ml) water
• 3/4 cup (110g) plain (all-purpose) flour
• 2 tablespoons self-raising flour
• 2 tablespoons cocoa powder
• 1 egg
• 1 teaspoon cocoa powder, extra
• White chocolate coffee cake
• 180 grams white eating chocolate
• 185 grams butter
• 3/4 cup (180ml) milk
• 1 cup (150g) plain (all-purpose) flour, sifted
• 1/3 cup (50g) self-raising flour, sifted
• 2 eggs
• 1 1/2 tablespoon instant coffee granules
• 1 tablespoon boiling water
• 2 teaspoons vanilla extract whipped
• Whipped white chocolate frosting
• 270 grams white eating chocolate, chopped coarsely
• 3/4 cup (180ml) thickened (heavy) cream
• 1 teaspoon vanilla extract