Step 1

Grease a 12.5cm x 35cm loose-based flan tin.

Step 2

Process biscuits until fine. Add butter; process until combined. Press mixture over base and sides of flan tin. Refrigerate 30 minutes.

Step 3

Preheat oven to 150°C.

Step 4

Break chocolate into a small heatproof bowl; place bowl over a small saucepan of simmering water, stirring, until chocolate is smooth (don't let water touch base of bowl). Cool.

Step 5

Split vanilla bean lengthways; scrape out seeds (keep vanilla pod for another use, see notes). Beat cheese, sugar, eggs and vanilla seeds in a small bowl with an electric mixer until thick and smooth. Add cooled melted chocolate and cream; beat until mixture thickens slightly. Pour filling into tin.

Step 6

Bake cheesecake for 30 minutes; cool in the oven with door ajar. Refrigerate 2 hours.

Step 7

Just before serving, place extra chocolate in a small heatproof bowl over a small saucepan of simmering water; stir until smooth. Top cheesecake with berries, drizzle with chocolate.