Make the icing five minutes before taking the cake out of the oven.
Southern Living NOVEMBER 2006
1. Sift together sugar and next 4 ingredients in a large bowl.
2. Stir together butter and next 3 ingredients in a saucepan over medium-low heat, stirring constantly, 5 minutes or just until butter and shortening melt. Remove from heat; pour over sugar mixture, stirring until dissolved. Cool slightly.
3. Stir in buttermilk, eggs, and vanilla. Pour into a greased and lightly floured 15- x 10-inch jelly-roll pan.
4. Bake at 350° for 30 to 35 minutes. (Cake will have a fudge-like texture.) Spread Chocolate Icing over hot cake. Serve with vanilla ice cream, if desired.
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