In a medium saucepan over medium heat, combine sugar and water. Stir until sugar has dissolved. Do not let boil.
Remove from heat and add the basil leaves. Let rest for 15 minutes, stirring occasionally. Leave in longer for a stronger flavor. Discard the basil.
Store in a mason jar for up to one week.
Notes
Fresh basil is recommended. Use any variety, such as sweet basil, Genovese basil or Thai basil. Dried basil will work, but keep in mind that it does lose its potency, so be sure to smell it before you use it. Use 2-3 teaspoons of dried basil in this recipe.
Just before dropping it into your syrup infusion, hold fresh basil leaves in one hand and clap your other hand on top of them to “spank” them. This process helps to release the essential oils and fragrances for a more aromatic syrup.
Use granulated or cane sugar for a clear syrup (best for cocktails like a mojito). Brown sugar or honey may be used, but they will have a darker, caramel-like color.