• Step 1: In a large resealable bag or bowl, combine the soy sauce, rice vinegar, brown sugar, sesame oil, garlic, ginger, and red pepper flakes (if using). Mix well until the sugar has dissolved.
• Step 2: Add the chicken to the marinade, making sure it is fully submerged. Seal the bag or cover the bowl and refrigerate for at least 30 minutes, or up to 8 hours (the longer the better for maximum flavor).
• Step 3: When ready to cook, remove the chicken from the marinade and discard the used marinade. Grill, sauté, or bake the chicken according to your preferred method until cooked through, with an internal temperature of 165°F.