Put the dark chocolate and butter in a bowl, melt in the microwave in 30s bursts, stirring in between (it should take 2-3 bursts)
When smooth, whisk in the sugar using an electric hand whisk
Next whisk in the egg and vanilla, and finally whisk in the flour until you have a smooth batter
Pour the mixture into well greased ramekins
The fondants can now be refrigerated, frozen or cooked straight away
To cook, heat an oven to 180C and cook for 10-12 minutes (or about 16 minutes from frozen)
