Combine all ingredients in a medium saucepan over medium heat. Whisk until smooth. When mixture comes to a boil, reduce heat, cover, and simmer for 20 minutes, stirring often. Remove pan from heat and let cool. Store covered in refrigerator.
Notes
Substitutions
Corn Substitutions: Corn is a common ingredient in products. Starch, modified food starch, dextrin and maltodextrin can be from corn. Consult with your physician to find out which corn derivatives you need to avoid. Many corn-free options are available in the US. Find out more about corn substitutions.