Making Huli Huli Chicken is a straightforward process if you follow these simple steps:

1. Prepare Marinade: In a bowl, mix together pineapple juice, soy sauce, brown sugar, minced garlic, grated ginger, black pepper, and red pepper flakes.
2. Marinate Chicken: Place the chicken thighs in a resealable plastic bag or a shallow dish. Pour the marinade over the chicken, ensuring it is well coated. Seal the bag or cover the dish and refrigerate for at least 1 hour or overnight for the best flavor.
3. Preheat Grill: Preheat your grill to medium heat. If using charcoal, create a two-zone cooking area with direct and indirect heat.
4. Remove Chicken from Marinade: Take the chicken out of the marinade and shake off any excess liquid. Reserve the marinade for basting.
5. Grill Chicken: Place the chicken thighs skin-side down on the grill. Grill for about 6-8 minutes until the skin is golden and crispy.
6. Flip and Baste: Turn the chicken over and baste with the reserved marinade. Close the grill lid and cook for another 8-10 minutes or until the internal temperature reaches 165°F (75°C).
7. Grill Pineapple (Optional): While the chicken is cooking, you can grill pineapple wedges for additional flavor. Grill for about 2-3 minutes on each side until grill marks appear.
8. Rest the Chicken: Once cooked, remove the chicken from the grill. Let it rest for about 5 minutes before slicing.
9. Serve: Garnish with chopped green onions and serve with grilled pineapple if desired.

These steps will guide you in creating this incredible Hawaiian dish effortlessly.