In a microwave safe bowl, add 200g dark cooking chocolate

Add 50g butter. In a microwave melt in bursts of 30 seconds

In a separate bowl add 250ml thickened cream, whip the cream until soft peaks form

Stir butter and chocolate mixture until combined

Separate the 4 eggs, whites in one container

Add the 4 yolks to chocolate mixture

Whisk egg whites until soft peaks form

Add 2 tablespoons caster sugar until mixture is thick and sugar has dissolved

Combine chocolate and egg yolks

Add thickened cream and fold through

Add egg whites

Fold through until combined

Add into individual bowls or ramekins and set in fridge for at least 3 hours