3 bittersweet chocolate soufflee with sauce Recipes

unsalted butter , cut into pieces, fine-quality bittersweet chocolate (not unsweetened), chopped, eggs, separated, superfine granulated sugar, navel or valencia oranges

whole steamed chestnuts or vacuum-packed roasted chestnuts, water, unsalted butter, room temperature, divided, sugar (for coating souffle dish) plus 14 tbsp , divided, whole milk, divided, egg yolks, cornstarch, salt, armagnac , cognac, or other brandy, vanilla extract, egg whites (about 8 large), cream of tartar