Continue to heat and stir moderately until boiling for a minute or two or until desired thickness.
The thing to remember about this recipe is to keep the ratio of sugar and water even. The rest of the recipe can be adjusted to your taste. To make it thinner or thicker, adjust the amount of cornstarch. *You can flavor it with cinnamon, vanilla, your favorite extract, coffee syrup or liqueur. If you are using an extract like vanilla, rum, almond, etc, 1-2 tsp will be plenty. For the coffee syrup or liqueur, depending on your preference, 2-3 TBSP usually works. Have fun with it.