Step 1

Mix all the ingredients in a saucepan EXCEPT the vanilla extract.

Step 2

While whisking on Medium heat, bring the mixture to a low boil, then lower the heat to Medium-Low and continue to whisk anywhere from 5 to 10 minutes.

Step 3

The longer you cook the mixture, the thicker it will be once it's cooled.

Step 4

Turn off the heat and add the vanilla extract.

Step 5

Cool slightly and pour the sauce into a jar.

Step 6

If not using it immediately, keep it in the refrigerator.