-
Preheat oven to 250 degrees. Grease a springform pan; dust with cocoa. Line bottom with kitchen parchment.
-
In 2 qt saucepan over low heat, melt chocolate with butter.
-
In large bowl, with wire whisk beat egg yolks and vanilla.
-
Slowly beat warm chocolate mixture into yolk mixture until blended.
-
In small bowl with mixer at high speed, beat egg whites until soft peaks form.
-
Gradually beat in 1/4 cup powdered sugar until sugar dissolves and whites stand in stiff peaks.
-
Fold beaten egg whites into chocolate mixture, one third at a time.
-
Spoon batter into pan spreading evenly.
-
Bake torte 1 hour or until toothpick inserted in center comes out almost clean.
-
Cool torte in pan.
-
When torte is cool, remove side of pan then remove torte from pan bottom; discard parchment.
-
Cut torte in 12 wedges. Sprinkle 6 wedges with cocoa, remaining 6 wedges with confectioners sugar.
-
Arrange wedges alternately on cake plate.