Raspberry cheesecake brownie

Ingredients

• 110 g butter
• 100 g dark chocolate
• 1 cup raw caster sugar
• 5 eggs
• 1/4 cup cocoa, sifted
• 3/4 cup plain flour
• 1/2 tsp vanilla, plus 1 teaspoon extra
• 750 g cream cheese
• 1 cup caster sugar
• 1/2 cup sour cream
• 120 g raspberries, fresh or frozen
• freeze-dried raspberries, to decorate (optional)
• raspberry syrup, to serve (optional)
• Raspberry syrup
• 1 cup fresh or frozen raspberries
• 1/4 cup water
• 2 tbsp sugar
• 1 heaped teaspoon arrowroot