Make the simple syrup by combining the sugar, water and mint leaves in a small saucepan. Bring the mixture to a boil and let it simmer for only two minutes. This allows the sugar to dissolve. Remove it from the heat and let it cool and then remove the mint leaves. {A simple syrup can be made up to a couple of weeks ahead and stored in the refrigerator. With an herb-based simple syrup, store it for up to one week in the refrigerator.}