Fleur de sel
1/2 cup Heavy cream
3 1/2 ounces Extra-bittersweet chocolate
Salt
2 tablespoons Creme fraiche
1/2 cup Heavy cream
1/2 cup Unsalted butter
1/4 cup Corn syrup
1/2 cup Water
2 cups Sugar
1 1/4 cups All-purpose flour
3/4 teaspoon Vanilla extract
1 Large egg yolk
1/4 cup Unsweetened cocoa
1 tablespoon Confectioners' sugar
1/2 cup Salted butter, at room temperature