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Grease and flour a 13x9x2 baking pan. Combine the first five ingredients in a bowl and set aside.
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In a mixer, cream the butter for 30 seconds. Add sugar and 1/2 teaspoon vanilla, mixing until well combined. Add 2 whole and three yokes (saving the three egg whites for the meringue), one at a time, beating one minute between each.
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Add dry mix and buttermilk alternately, then mix until well combined.
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Bake for 30 minutes in 350 degree oven.
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For the Meringue, beat 3 egg whites and 1/2 teaspoon vanilla for two minutes until soft peaks form. Gradually add the brown sugar 1 tablespoon at a time, beating for four minutes on high.
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Top hot cake with Meringue, sprinkle with coconut, and bake for 5 minutes or until golden. Store in refrigerator.