1 cup (250 ml) water
1/2 cup (100 g) sugar
1/2 cup (160 g) light corn syrup or agave nectar
3/4 cup (75 g) unsweetened cocoa powder (preferably Dutch-processed)
2 ounces (55 g) bittersweet or semisweet chocolate, finely chopped
In a medium saucepan, whisk together the water, sugar, corn syrup (or agave), and cocoa powder.
Bring to a boil over medium heat. Once it’s just begun to simmer and boil, remove from heat and stir in the chopped chocolate until melted.
Let the Chocolate Sauce stand for a few hours before serving.