In a saucepan, combine 1 cup of water, 1 cup of granulated white sugar, and 1 cup of unsweetened cocoa powder.
Heat the mixture on medium heat and whisk until all the cocoa is dissolved.
Bring the mixture to a simmer and simmer for 5 minutes.
Pour the mixture into a jug.
Let the syrup cool; it will thicken as it cools.
