Creating Crispy Japanese BBQ Chicken Thighs is straightforward if you follow these simple steps:

1. Prepare the Marinade: In a bowl, whisk together the soy sauce, mirin, sesame oil, brown sugar, rice vinegar, minced garlic, and grated ginger until well combined.
2. Marinate the Chicken: Place the chicken thighs in a resealable plastic bag or a shallow dish. Pour the marinade over the chicken, ensuring all pieces are well coated. Seal the bag or cover the dish and refrigerate for at least 1 hour or overnight for best results.
3. Preheat the Grill: About 15 minutes before cooking, preheat your grill to medium-high heat.
4. Remove Chicken from Marinade: Take the chicken thighs out of the marinade and let any excess liquid drip off. Discard the marinade.
5. Grill the Chicken: Place the chicken thighs skin-side down on the grill. Cook for 5-7 minutes, or until the skin is crispy and golden brown.
6. Flip and Cook: Turn the chicken thighs over and reduce the heat to medium. Grill for an additional 15-20 minutes, or until the internal temperature reaches 165°F (75°C).
7. Rest the Chicken: Once cooked, remove the chicken from the grill and let it rest for about 5 minutes. This helps retain the juices.
8. Garnish and Serve: Sprinkle the grilled chicken with chopped green onions and sesame seeds for an added touch.

These steps will guide you in creating these incredible chicken thighs effortlessly.