In a medium saucepan, combine all the ingredients and bring to a boil. Once it is boiling and the sugar has been dissolved, turn off the heat.
Purée until smooth with an immersion blender or transfer the mixture to a blender and purée until smooth. Strain through a mesh strainer to remove the seeds.
Store in a sealed container in the refrigerator for up to 1 week or freeze to use at a later date.