In a medium saucepan, add all of the ingredients. Whisk everything together to ensure the cornstarch is fully dissolved before heating.
Place the saucepan over medium heat and bring the sauce to a gentle boil. Once it begins to boil, reduce the heat to medium-low and let the sauce simmer for about 5 minutes, stirring frequently. This will help the sauce thicken and the flavors to meld together.
After 5 minutes, remove the sauce from the heat. Let it cool for 5 to 10 minutes to thicken further. You’ll notice it becoming glossy and smooth as it cools.
Once the sauce has cooled to room temperature, pour it into a clean jar or bottle. Seal tightly and store it in the refrigerator. This sauce will stay fresh for up to 3 weeks.
Notes
Keep tightly sealed in the fridge for up to 3 weeks. Stir before each use.