1 cup organic cocoa powder
1 cup organic granulated sugar
1/2 teaspoon kosher salt (or to taste)
1 cup cold water
1 tablespoon vanilla extract
In a medium saucepan, whisk together the cocoa powder, sugar, salt (if desired). Whisk in the water and whisk over medium heat until boiling, stirring constantly.
Continue boiling 3 – 4 minutes. The mixture may still be thin (it thickens more once cool).
Remove from heat and whisk in the vanilla. Cool.
Store syrup in an airtight glass container in the refrigerator. The syrup should keep, refrigerated, for about a month.