4. In a small saucepan, whisk together mirin, orange juice, soy sauce, honey, rice vinegar, ginger, and red pepper flakes. Bring to a low boil and reduce heat to medium. Simmer for about 10 minutes, or until slightly reduced.
5. In a small bowl, whisk together cornstarch and water. Whisk into the teriyaki sauce. Cook and stir until thickened and bubbly.
6. Just before serving, brush teriyaki onto cooked chicken. Enjoy!