This is the Kalouga flavor. Salted Butter Caramel in dark chocolate.
I had been curious about Bernachon. He is one of the few chocolatiers in the world to make his chocolate starting with the cacao bean.
He is based in Lyon. Besides getting them from Lyon, there is one other place to get them - a cute little Paris shop called L'Etoile D'Or in the otherwise grimy Pigalle area.