Combine the cocoa powder, sugar, and salt in a saucepan. Add the water and mix until smooth.
Bring the mixture to a boil. Allow it to boil for one minute, being careful not to let it boil over. Then remove the saucepan from the heat and allow the chocolate syrup to cool.
Add the vanilla extract and stir to combine.
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Recipe Tips
Store the homemade chocolate sauce in your refrigerator for up to 10 days in an airtight container.