Steps
1. In a small bowl, whisk together cocoa powder, sugar, and salt.
2. Add milk and whisk until the mixture is smooth and the sugar is dissolved.
3. Stir in heavy cream and vanilla extract.
4. Pour the mixture into a small container suitable for freezing.
5. Freeze for 1 hour, then stir vigorously with a fork to break up ice crystals.
6. Repeat stirring every 30 minutes for 2-3 hours until creamy and frozen.
7. Serve immediately or store in the freezer until ready to enjoy.