Meanwhile, in a large bowl, beat the eggs with the sugar. Using a rubber spatula, gently fold in the cooled chocolate mixture. Sift the flour, cocoa powder and the remaining 1/2 teaspoon of salt over the mixture and stir until incorporated. Pour the batter into the prepared pan and bake for about 20 minutes, or until a tester inserted in the center comes out with fudgy crumbs attached. Transfer the pan to a rack and let the brownies cool completely.