Steps
- Mix ½ cup of unsweetened cocoa powder, 1¼ cups of sugar, and 2 drops of vanilla extract in a heatproof bowl. Bring 3 cups of water to a boil in a saucepan.
- Whisk a little boiling water into the cocoa mixture until smooth. Add ⅓ cup of dark chocolate chips, with at least 70% cocoa, then whisk in the remaining boiling water until the chocolate melts.
- Cool to room temperature, pour into a shallow freezer-safe container, and cover. Freeze for 30 minutes, then scrape with a fork to break up the ice.
- Freeze and scrape every 30 minutes another 3-4 times, until thick and finely icy.