Whisk the , sour cream, milk and confectioners' sugar until smooth in a medium bowl; set aside.
Sift the flour, , baking soda, baking powder and 1/2 teaspoon salt into a large bowl. Beat the eggs and granulated sugar in a medium bowl until pale yellow; beat in the buttermilk, melted butter, food coloring, vanilla and vinegar. Add the egg mixture to the flour mixture and fold just until incorporated.
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