INGREDIENTS
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1/2 cup (1 stick) unsalted butter
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2 1/2 tablespoons cocoa powder
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1/2 teaspoon kosher salt
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1/2 cup water
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1 cups all-purpose flour
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3/4 cup and 2 tablespoons sugar
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3/4 teaspoons baking soda
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1 large egg
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1/4 cup sour cream
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1/2 teaspoon pure vanilla extract
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2 ounces bittersweet chocolate, finely chopped (I used half milk half semi-sweet chocolate)
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1 tablespoons agave nectar (or corn syrup)
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1/4 cup heavy cream*
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1 tablespoons sugar