Step 1

Combine the cocoa powder, sugar, salt, and water in a medium saucepan.

Step 2

Put the saucepan over medium heat. Whisk constantly until the mixture thickens and begins to simmer.

Step 3

Let it simmer for about 3 minutes, stirring occasionally.

Step 4

Remove the pan from the heat and add in the vanilla. It will thicken as it cools so don't worry if it seems thin.

Step 5

Let the syrup cool before storing it in an airtight jar.