DIRECTIONS:
- Preheat the oven to 350 degrees F (175 degrees C). Grease two 9 inch round cake pans. Dissolve the espresso powder and cocoa powder in the hot water; set aside to cool slightly.
- In a large glass or metal bowl, whip egg whites to soft peaks. Gradually sprinkle in 1/4 cup sugar while continuing to whip until stiff, but not dry.
- In a separate bowl, whip egg yolks with remaining sugar until thick and pale, about 5 minutes. Stir in the espresso mixture, then sift in the flour, baking powder and salt. Gently stir until incorporated. Fold 1/3 of the egg whites into the batter until very well mixed, then gently fold in the remaining egg whites. A few streaks are okay. Divide the batter between the two prepared pans, and spread evenly.
- Bake for 25 to 30 minutes in the preheated oven, until the top of the cake springs back when lightly pressed.
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