Use the best cocoa you know for these fabulous brownies. Alice Medrich Yield: Makes 16 large or 25 smaller brownies 10 tablespoons (1 1/4 sticks) unsalted butter 1 1/4 cups sugar 3/4 cup plus 2 tablespoons unsweetened cocoa powder (natural or Dutch-process) 1/4 teaspoon salt 1/2 teaspoon pure vanilla extract 2 cold large eggs 1/2…