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TO MAKE THE CAKE:
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Set a large mixer bowl in a sink filled with 2 inches of warm water. Separate eggs.
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NOTE:
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it is best to separate eggs while they are still cold, straight from the fridge.
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(you should have about 1 1/2 cups whites). Pour the whites into the warm mixer bowl and place yolks in a smaller mixer bowl (or let separated eggs stand, covered, at room temperature for 30 minutes).
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Meanwhile, in a small, heavy saucepan, partially melt unsweetened chocolate and semisweet chocolate pieces over low heat. Turn off heat and stir (chocolate will continue to melt).
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Preheat oven to 350u00b0F.
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Cut a waxed paper liner for the bottom of a 10-inch tube pan, cutting it 1/2-inch wider than the pan and the center hole slightly larger than the tube.
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Grease pan thoroughly.
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Place liner in pan and grease liner.
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Beat egg yolks with an electric mixer on high speed for about 4 minutes or till they're thick and lemon colored.
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Add the 2/3 cup sugar, beating till very thick. Stir in the melted chocolate and chopped nuts.
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Thoroughly wash and dry beaters.
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Beat egg whites with vanilla and almond extract till foamy.
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Gradually add the 1/4 cup sugar to egg whites, beating till soft peaks form.
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Lighten egg yolk mixture with about 2 cups beaten egg whites.
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Add to the remaining egg white mixture and fold together to combine.
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Turn batter into prepared pan.
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Bake for about 40 minutes or till top springs back when lightly touched.
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Run a knife around the edge of the pan and center to loosen.
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Cool in pan for 1 hour.
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INVERT onto cake plate. Remove waxed paper.
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Spread glaze over top and sides of cake.
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TO MAKE THE DARK CHOCOLATE GLAZE:
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In a small heavy saucepan or skillet, melt chocolate over low heat.
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Remove from heat and stir in butter or margarine.
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In a small bowl, dissolve instant coffee in hot water.
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Stir in the sour cream and maple flavoring.
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Add sour cream mixture to chocolate, stirring till smooth and shiny.