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Cake:
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Preheat oven to 350 degrees.
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Combine butter, cocoa and water in a saucepan.
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Cook, stirring constantly, over low heat until the mixture is smooth and butter has melted; remove from heat and cool.
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Combine the buttermilk, eggs, baking soda and vanilla; beat on medium speed with a mixer until smooth.
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Combine the butter mixture and buttermilk mixture; beat until well blended.
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Combine the sugar, flour and salt in a bowl; mix well.
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Gradually add the flour mixture to the buttermilk mixture; beat until blended.
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The batter should be thin.
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Spray three 8" round cake pans with cooking spray and line them with wax paper.
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Pour the batter evenly into the pans and bake at 350 degrees for 22-24 minutes or until cake tests for doneness.
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Cool in pans on wire racks for 10 minutes; remove from pans and cool completely.
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To assemble the cake:.
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Spread 1/2 c ganache between the cake layers; spread the remainder on the sides of the cake and chill for 30 minutes.
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Slowly pour the frosting over the center of the cake.
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Spread it to the edges of the cake, allowing some frosting to run down the sides.
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Chocolate Ganache:.
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Microwave the chocolate and cream in a glass bowl for 2-3 minutes, or until the chocolate is melted; whisk until smooth.
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Gradually add the butter, whisking until smooth and melted.
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Cool, whisking often, until spreading consistency, about 15-20 minutes.
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Praline Frosting:.
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Combine the butter, brown sugar and whipping cream in a 2 quart saucepan; bring to a boil, stirring often.
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Boil 1 min; remove from heat and whisk in powdered sugar and vanilla.
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Add the pecans and stir gently for 2-5 minutes, or until the frosting begins to cool and thicken slightly.
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Pour immediately over the cake.