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Preheat oven to 350 degrees.
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Grease and flour three 8-inch round cake pans.
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Cream together butter and sugar with electric mixer until fluffy.
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Add the eggs, one at a time and beat well after each.
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Make a paste with the food coloring and cocoa.
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(It takes a few minutes to get the chocolate to absorb liquid--be patient and keep stirring).
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Add this paste to the butter/sugar mixture.
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Sift together the flour, salt and baking soda.
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Add it to the sugar/butter mixture alternately with the buttermilk, mixing well between additions.
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(Begin and end with dry ingredients).
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After last addition of flour mixture, stir in vanilla and vinegar.
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Beat for another minute and then divide into 3 prepared pans.
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Bake for about 35 minutes, or until done.
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Cool for 10 minutes and then remove from pan to wire rack to cool completely.
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To make icing: Mix flour and milk in small pan and cook over low heat until it is thick (stirring often--constantly near end).
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This will take about 10 minute.
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Remove from heat and allow to cool completely.
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Meanwhile, cream together the butter, sugar and vanilla.
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Beat until it is very light and fluffy, about 10 minutes.
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When the flour mixture is cooled, add it to the butter mixture and beat until just mixed.
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Assemble the cake with a thin layer of icing between the layers and cover the top and sides of cake.