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Preheat oven to 325* (F).
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Spread solid shortening on bottom and sides of two 9-inch layer pans, or one 9x13x1 1/2 inch sheet pan.
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Dust evenly with unsweetened cocoa or flour; tap out excess.
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Sift together flour, baking soda, salt, and nutmeg.
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Set aside.
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Melt chocolate in top pan of double boiler.
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Remove chocolate from heat after completely melted, and set aside to cool until comfortable to touch.
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In large mixing bowl, cream butter and sugar together.
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Add eggs one at a time, beating well after each addition.
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Add flour mixture, alternating with buttermilk, beginning and ending with flour mixture.
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Add vanilla and cooled chocolate.
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Pour mixture into prepared pan (s).
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Bake in lower third of oven for 40-50 minutes for sheet cake, or 35-45 minutes for layer pans, or until toothpick comes out clean.
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Leave cake in layer pans for 10 minutes; remove to wire rack and cool completely.
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Cool sheet cake completely in pan.
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Split cake layers with serrated knife-- fill and frost the layers with chocolate buttercream icing or flavored whipped cream.