01 -
In a medium saucepan, add pineapple juice, light brown sugar, rice vinegar, ketchup, and low-sodium soy sauce.
02 -
Set the saucepan over medium heat and whisk until the sugar is fully dissolved. Bring the mixture to a gentle boil.
03 -
In a small bowl, whisk cornstarch with cold water until smooth to create a slurry.
04 -
Gradually drizzle the cornstarch slurry into the boiling sauce while whisking constantly to avoid lumps.
05 -
Continue to cook and whisk for 1–2 minutes until the sauce thickens. Remove from heat and stir in red food coloring if desired.
06 -
Allow the sauce to cool completely; it will thicken further as it cools. Transfer to a container for serving or storage.