INGREDIENTS
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1 1/4 cup all-purpose flour
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1/2 teaspoon baking soda
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1/2 teaspoon salt
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1/3 cup buttermilk
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1 teaspoon vanilla extract
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6 tablespoons unsalted butter
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1/2 cup granulated sugar
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1 large egg
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1 1/2 cup confectioner's sugar, sifted
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1 tablespoon light corn syrup
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2 teaspoons lemon juice
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1/2 teaspoon vanilla extract
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2 tablespoons water
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1/8 teaspoon salt
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6 tablespoons cocoa powder, sifted
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1/4 teaspoon instant espresso powder