Prepare all the ingredients.
Grease 6 ramekins with melted butter.
Chop the coating chocolate...
...and melt it in a bain-marie.
When melted...
...pour the melted butter in it...
...and stir well.
the eggs with 40 g sugar.
Pour the chocolate preparation on the eggs.
Mix...
...and divide this mixture between the 6 ramekins.
Place in the fridge for 5 hours.
Cut the salted butter in dice.
Pour the remaining caster sugar and 2 Tablespoons water in a saucepan.
Cook until you obtain a caramel.
Remove from the heat and add the salted butter stirring to incorporate well.
Using 2 forks back to back and dipped in the caramel...
...form caramel strings above a sheet of parchment paper by back and forth movement.
Place the ramekins in hot oven at 180°C and leave to bake 12 minutes.
When removed from the oven, leave to cool for about 10 minutes and flip them onto a dessert plate.
Decorate with caramel strings. Serve immediately along with a chocolate sauce or a crème anglaise.