Ingredients
5 ounces bittersweet chocolate, chopped
1 tablespoon unsalted butter
1/4 cup plus 3 tablespoons sugar
2 tablespoons all purpose flour
1 teaspoon unsweetened cocoa powder
3/4 cup whole milk
1/4 teaspoon vanilla extract
4 large egg yolks
5 large egg whites
1/4 teaspoon coarse kosher salt