Preheat the oven to 190˚C/170˚C fan/Gas 5
Grease 4 ramekins with unsalted butter.
Dust inside of ramekins with cocoa powder
Put the butter and chocolate into a large heatproof bowl set over a pan of gently simmering water (don’t let the bottom of the bowl touch the water underneath) and leave until melted, stirring occasionally
Remove from the heat, sift over the flour and then whisk it in
In a separate bowl, whisk together the eggs, egg yolks and sugar until combined, then whisk this into the chocolate mixture, until smooth and well combined
Pour the chocolate mixture into the ramekins.
Leave to set in fridge for minimum 20 minutes but can be overnight
Bake for 12 minutes – the fondants are ready when you shake each one gently and only the middle moves a little
Remove from the oven, and gently loosen the edge.
Carefully invert each fondant onto a plate. Serve with crème fraiche or vanilla ice cream, mint and berries.