Mix water and sugar together in large pot. Mix well and bring to a gentle boil. Once the mixture is boiling, add your vinegar, reduce until the mixture becomes syrupy. As it reduces you can throw in fresh bunches of mint to give the syrup a minty flavor, just spoon them out before storing them.
Once the mixture has thickened (about 20 minutes), allow it to cool and then pour into a sturdy glass jar. Refrigerate (keeps for a few months).
Pour a few tablespoons of the syrup over ice in a glass, add a few sprigs of fresh mint, then add water.
Typically people will peel and grate a persian cucumber and use that to garnish the drink.
Enjoy