Our number-one seller during Passover, this cake literally melts in your mouth. It has intense, full chocolate flavor without all the fat of the traditional chocolate cake. Serve with a dollop of whipped topping and fresh ripe raspberries.
Preheat oven to 350°F (175°C). Spray a 9-inch springform pan with vegetable oil spray.
Place chopped chocolate chips in a large bowl; set aside. In a small bowl, beat 1 egg white with cream of tartar until stiff peaks form; set aside.
In a medium saucepan, heat cocoa, fructose, and milk until simmering, stirring constantly. Remove from heat and pour over chocolate chips. Whisk in 1 cup egg whites, then fold in beaten egg white.
Pour batter into prepared pan and set in another pan at least 2 inches wider and deeper. Add enough water to bottom pan to come two-thirds up the side of the cake pan. (This is so edges won't burn.) Bake 30 minutes. Chill in refrigerator 8 hours before serving.