In a pot add the sloe berries and water and bring to a boil. Then simmer over a medium heat for about 10 minutes.
Once the sloe berries are soft and pulpy, remove from the heat and pass through a sieve. Gently press down to extract the juice. Do not press down too much as we only want the juice and not the pulp.
Set aside the pulp for another recipe (check out my sloe berry brownie recipe.)
Bring the juice back into a pot. Add the sugar and balsamic and bring to a quick boil. Then simmer for about 5 to 10 minutes till the liquid is a syrup. We want the syrup to form a drop at the end of the spoon and not just roll off. Check the video.
Transfer the sloe balsamic into a sterilised bottle and allow to cool before refrigerating.
Use as desired, to add flavour to roast vegetables or salads.