INGREDIENTS
1/2
cup/114 grams unsalted butter (1 stick), softened, plus more for coating dish
4
tablespoons/50 grams granulated sugar, plus more for coating dish
8
ounces/225 grams bittersweet chocolate (60 to 65 percent cacao), finely chopped
6
eggs, separated, at room temperature
fine sea salt
1/2 tsp
cream of tartar