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