1. Preheat the oven to 180°C (traditional oven).
2. Melt the chocolate and Alsace Lait butter in a bain-marie or in the microwave.
3. Meanwhile, whisk the eggs with the sugar until the mixture lightens.
4. Stir the melted chocolate into the egg-sugar mixture, then add the flour and fleur de sel. Mix until you have a smooth dough.
5. Pour the mixture into greased and floured silicone moulds or ramekins.
6. Cook for 7 to 8 minutes. The centre must remain liquid.
7. Remove from the oven and leave to rest for 1 minute. Then carefully turn each ramekin upside down onto a plate and remove from the mould.
8. Serve warm with a scoop of vanilla ice cream or a red fruit coulis.
Photo credit: Marie Soehnlen