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Ingredients

• 1 cup unsalted butter, plus more for the pan
• 1/3 cup cocoa powder (we use Dutch processed)
• 1 teaspoon kosher salt
• 1 cup water
• 2 cups all-purpose Gold Medal flour, plus more for the pan
• 1 3/4 cups granulated sugar
• 1 1/2 teaspoons baking soda
• 2 large eggs
• 1/2 cup sour cream (or Greek yogurt)
• 1 teaspoon pure vanilla extract
• 4 ounces bittersweet chocolate, finely chopped
• 1 1/2 tablespoons corn syrup (or agave nectar)
• 1/2 cup heavy cream
• 1 1/2 tablespoons granulated sugar