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Heat oven to 350°F.
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Grease and flour 9 x 13-inch baking pan.
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In large bowl, combine sugar and butter.
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Using electric mixer, cream sugar and butter until light and fluffy.
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Add eggs one at a time, beating well after each.
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Add vanilla; mix until blended.
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Combined dry ingredients, and then add alternately with half and half to butter mixture, and mix until blended.
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Spoon batter into prepared cake pan; with metal spatula, spread batter evenly in pan.
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Bake at 350°F 30 to 35 minutes or until a wooden toothpick inserted in center comes out clean.
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Cool 10 minutes; loosen from sides of pan.
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Invert on cooling rack.
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To make frosting, heat water in top of double boiler to simmer.
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With electric mixer, beat in egg whites, sugar, cream of tartar, and vanilla until soft peaks form (about 7 minutes).
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Remove pan from heat.
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Cool 15-20 minutes.
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With top side of cake up, spread frosting on top and sides.
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Sprinkle coconut onto top and sides; pat gently into frosting.