This flourless cake, featuring both chocolate and cocoa, is rich, rich, RICH! A thick icing of chocolate ganache glaze takes it over the top. Depending on how you observe Passover, this cake can make a great addition to your Seder since it contains neither flour nor leavening; and of course, it's also ideal for those looking to avoid gluten. Want to reduce the carbs and calories in this recipe? Substitute our King Arthur Baking Sugar Alternative for the sugar called for. See how in "tips," below.