Caramel mud cakes

Ingredients

• 125 gram butter, chopped coarsely
• 100 gram white eating chocolate, chopped coarsely
• 2/3 cup (150g) firmly packed light brown sugar
• 1/4 cup (90g) golden syrup (or treacle)
• 2/3 cup (160ml) milk
• 1 cup (150g) plain (all-purpose) flour
• 1/3 cup (50g) self-raising flour
• 1 egg
• Fluffy frosting
• 1/2 cup (110g) caster (superfine) sugar
• 2 tablespoon water
• 1 egg white
• red food colouring