Combine balsamic vinegar and sugar in a small saucepan. Bring it to a boil over medium high heat.
Once it boils, reduce the heat to medium low and let it simmer until it reduces and gets a bit thicker. Stir occasionally. It might take 15-20 minutes. Don't stay too close to the saucepan as the steam coming from it smells too sharp. It might be really disturbing for your eyes and nose.
Remove from the heat, let it cool completely and use immediately or store in a small jar.
NOTES
Make sure to stir it occasionally. Otherwise, it might get caramelized.
These measurements make about ¼ cup of reduced balsamic (substitute for pomegranate molasses). If you need more than this, increase the amount accordingly. But increase the amount of sugar gradually. It is not supposed to be too sweet.
To Store: Put it in a small container like a clean jar or bowl and keep it at room temperature for up to a week or longer in the refrigerator.