In a medium saucepan, combine water, granulated sugar, and unsweetened cocoa powder.

Whisk the mixture over medium heat until smooth.

Stir in the instant coffee granules and mix until dissolved.

Increase the heat and bring the mixture to a boil.

Once boiling, reduce the heat to low and let it simmer for about 5 minutes.

Take the saucepan off the heat and let it cool for a few minutes.

Stir in the vanilla extract once the syrup has cooled slightly.

Transfer the syrup into a jar or bottle for storage.