INGREDIENTS
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1 cup unsalted butter, plus more for the pan
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1/3 cup cocoa powder (I used Hershey's cocoa)
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1 teaspoon kosher salt
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1 cup water
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2 cups all-purpose flour
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1 3/4 cups granulated sugar
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1 1/2 teaspoons baking soda
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2 large eggs
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1/2 cup sour cream
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1 teaspoon pure vanilla extract
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4 ounces bittersweet or dark chocolate, chopped
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1 1/2 tablespoons corn syrup (or agave nectar)
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1/2 cup heavy cream
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1 1/2 tablespoons granulated sugar