In a small pot, combine the sugar, red pepper flakes, mirin, water,ginger, garlic, and soy sauce
Reduce the heat to medium and let the food cook
In a small bowl, place 2 teaspoons of the teriyaki sauce
Stir in the cornstarch after that
Return the sauce to a boil and cook, stirring, for an additional 5 to 8 minutes
or until slightly thickened. It calls for one cup of sauce
Once the mixture has cooled to normal temperature, remove it from the heat source
Alternatively, you may cover and store it in the refrigerator for up to a week