Preheat oven to 350°F (180C). Using a medium bowl, dissolve cocoa in coffee; set aside to cool at room temperature. Combine 1/2 cup sugar, the flour and salt. Place egg whites in large mixing bowl and set it over a larger bowl of hot water. Stir for several minutes until egg whites come to room temperature. Beat egg whites until frothy. Add cream of tartar and continue beating until soft peaks form. Gradually add remaining sugar and beat until stiff peaks form. Do not over beat. Sift the flour mixture over the beaten egg whites in 3 parts, folding in gently after each sifting. Stir approximately 1 cup of egg white mixture into the coffee mixture. Fold it back into the egg white mixture until combined.
Pour the batter into a spring-form cake pan. Smooth the top and run a small knife through the batter to remove any air pockets.
Bake for 50-60 minutes, or until the top springs back when lightly touched. Allow cake to sit in pan until nearly cool. With a knife, loosen the edges and invert the cake onto a serving platter.
Calories From Fat
% Daily Value*
Total Fat 0g
Saturated Fat 0g
Trans Fat 0g
Dietary Fibers 0g
* Percent Daily Values are based on a 2,000 calorie diet.
* Nutrition information is estimated based on the ingredients and cooking instructions as described in each recipe and is intended to be used for informational purposes only. Please note that nutrition details may vary based on methods of preparation, origin and freshness of ingredients used.