Put the berries, water and sugar into a small sauce pan. Stir to combine, and bring to a simmer on the stove.
Turn heat down to low and using the back of the spoon, press down on the berries to extract more juice and flavor.
Simmer for another 7-8 minutes, stirring every 30-60 seconds, and watch carefully to ensure it doesn't burn.
Remove from heat and strain liquid into bowl.
Add aronia berry concentrate into syrup. Stir to combine.
Let cool and place in storage bottle with lid. Refrigerate.