Use 1- 2 tablespoons of syrup per 1 cup of coffee.
The syrup is good for 3 weeks when stored in an airtight container in the refrigerator.
Syrup can be used to sweeten coffee, tea, lattes, and cocktails.
It's not necessary to boil the water. You can even stir brown sugar in hot water until the sugar dissolves.
Light or dark brown sugar can be used to make this syrup. The darker the sugar, the darker the color of the syrup. The difference between light and dark brown sugar is how much molasses is in it and the more there is, the more caramel and toffee flavor the syrup will have. If you want a richer, more caramel flavor, go for dark brown sugar since it contains more molasses.
If you want to give your brown sugar syrup an upgrade, add a little vanilla extract, which I consider a flavor enhancer. It's not necessary, but if you have it, use it. Add a teaspoon of vanilla extract to the recipe.
Use filtered water for a better tasting simple syrup.