INGREDIENTS
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½ cup milk
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1½ tsp. white vinegar
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¾ cup shortening, plus more for greasing
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2 cups flour
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2 cups sugar
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2 tsp. ground cinnamon
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1 tsp. baking soda
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½ cup cocoa powder
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8 tbsp. unsalted butter
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3 eggs, lightly beaten
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FOR THE ICING:
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2 cups confectioners' sugar
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3 tbsp. cocoa powder
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¼ cup milk
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5 tbsp. unsalted butter