In a small saucepan, combine sugar and water over medium heat. Stir until sugar dissolves.

Once sugar is dissolved, add optional flavorings like vanilla bean, herbs, spices, or citrus peel.

Let the mixture simmer gently for a few minutes to infuse flavors without boiling. Remove from heat and let it steep.

Strain the syrup to remove solids, then cool to room temperature. Refrigerate to chill and thicken.