1 cup pineapple juice
3/4 cup packed light brown sugar
1/3 cup rice vinegar
3 tablespoons ketchup
2 tablespoons soy sauce
1-1/2 tablespoons cornstarch dissolved in 2 tablespoons water
Optional: 2-3 drops natural red food coloring
Place all of the ingredients, except for the cornstarch slurry, in a small saucepan and bring to a boil. Stir in the cornstarch slurry and simmer for another minute until thickened, stirring constantly. If using red food coloring, stir it in.
Let the sauce cool completely and store in an airtight container in the refrigerator where it will keep for 2-3 weeks.