Preparation :15 minutes
Cooking :10 minutes
Waiting :2 hrs
Butter a Pyrex pie dish or a baking dish (which fits in the microwave).
In a bowl, whisk the whole eggs with the sugar for a long time until the mixture foams and whitens, then, little by little, add the flour while whisking.
Melt the chocolate cut into pieces with the butter in the microwave.
Add the chocolate and butter mixture to the previous preparation and stir well.
Pour the batter into the dish, then cook for 10 minutes in the microwave on high power.
Let the cake cool, then let it harden for 2 hours in the refrigerator.
Serve chilled.