The best hot chocolate

Method

1. Gently warm the milk, sugar and vanilla paste in a medium saucepan until just steaming. Put the cornflour and cocoa powder in a small mixing bowl, then spoon in a little of the warm milk. Mix until just combined, then pour back into the pan. Whisk for 4-5 minutes until well combined and thickened.
2. Add the dark and milk chocolate and let it melt. Stir in the double cream, then serve.