INGREDIENTS
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Cake
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3/4 cup unsalted butter, room temperature
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2 cups sugar
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1 egg
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2 1/2 cups flour
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1 teaspoon baking soda
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1/2 cup cocoa powder
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1/2 teaspoon salt
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1 teaspoon vanilla
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1 1/2 cups water
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2 scant tablespoons distilled white vinegar
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Frosting
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1 1/2 cups powdered sugar
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1/4 cup unsalted butter, room temperature
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1/3 cup cocoa powder