Combine ingredients in a small saucepan on high until boiling. Reduce heat to medium and simmer for 10 minutes or until the syrup has thickened, stirring frequently.
Remove from heat and cool for 10 minutes. Optional: strain the syrup before transferring it into a mason jar or bottle.
Use a funnel to pour the syrup into a bottle. Seal tightly and refriferate for up to 3 weeks.