Preheat your oven to 200°C (180°C fan).
Generously butter the ramekins and dust them with cocoa powder.
100 g Unsalted Butter, Cocoa Powder
Tap out the excess to avoid clumps.
In a heatproof bowl, melt the dark chocolate and butter together over a pan of simmering water (double boiler method).
100 g Dark Chocolate, Butter
Stir until smooth and allow to cool slightly.
In another bowl, whisk together the eggs, egg yolks, and caster sugar until light and fluffy.
2 Medium Eggs, 2 Egg Yolks, 100 g Caster Sugar
This helps incorporate air, giving the fondants their structure.
Slowly pour the melted chocolate mix into the egg mixture while whisking.
Sift in the flour and gently fold everything together.
50 g Plain Flour
Pour the mixture into the prepared ramekins, filling each about ¾ of the way.
Bake for 10–12 minutes. The edges should be set, but the centre should still wobble slightly.
Let them sit for a minute or two, then run a knife around the edge and invert onto a plate.
Serve immediately with ice cream or fresh cream.