INGREDIENTS
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For the cupcakes:
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1 & 1/2 cups all-purpose flour
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3/4 cup unsweetened Dutch-process cocoa powder
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1 & 1/2 cups granulated sugar
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1 & 1/2 teaspoons baking soda
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3/4 teaspoon baking powder
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3/4 teaspoon salt
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2 large eggs
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3/4 cup buttermilk
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3 tablespoons vegetable oil
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1 teaspoon vanilla extract
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3/4 cup warm water
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sea salt, for garnish
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For the filling:
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2 & 1/2 cups sugar
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2/3 cup water
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1 tablespoon light corn syrup
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3/4 cup heavy cream
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2 & 1/2 teaspoons sea salt
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For the frosting:
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1/2 cup plus 1 tablespoon unsweetened Dutch-process cocoa powder
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1/2 cup plus 1 tablespoon boiling water
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2 & 1/4 cups unsalted butter, room temperature
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3/4 cup confectioners’ sugar, sifted
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1/4 teaspoon salt
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1 & 1/2 pounds semi-sweet chocolate, melted and cooled