9 oz. semi-sweet chocolate
6 tablespoons butter
1/4 cup brewed coffee
8 eggs, separated
1/3 cup sugar

Preheat oven to 350°F. Grease and flour a 9-inch round baking pan. In a small saucepan, melt chocolate, butter and coffee over low heat. Cool slightly. In a large mixing bowl at high speed, slightly beat egg whites. Gradually, add sugar while continuing to beat. Beat until stiff peaks form. In a small bowl at high speed, beat yolks until pale yellow. Add 1/3 cup chocolate mixture to the yolks. Beat until blended. Add remaining chocolate mixture to the yolks; blend thoroughly. Fold chocolate mixture gently into egg whites until no streaks of white remain. Pour into prepared pan and bake until puffed and cake tester or toothpick inserted near the center comes out clean, about 1 hour and 15 minutes. Cool slightly or thoroughly chill before cutting.