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Preheat oven to 350ºF degrees (180 C).
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Grease and line a 9 x 13-inch rectangular cake pan.
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Place all ingredients except eggs and flour into a large saucepan, bring to boil while stirring gently, then simmer 2-3 minutes.
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Cool.
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Beat the eggs lightly, then add to cooled chocolate mixture.
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Sift in the flour slowly, stirring thoroughly as you add to avoid lumps.
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Pour batter into prepared pan and bake in preheated oven for 55-60 minutes or until a cake tester inserted into cake comes out clean.
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Cool cake on rack for 15 minutes, then invert cake onto rack to cool completely.
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Dust with confectioners' sugar or if preferred cocoa powder.
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If desired, frost or glaze cake when completely cooled.