1. Make the Marinade – In a large bowl, whisk together the pineapple juice, soy sauce, brown sugar, ketchup, rice vinegar, garlic, ginger, sesame oil, and black pepper until well combined.

2. Marinate the Chicken – Place the chicken in a resealable plastic bag or shallow dish and pour the marinade over the top. Seal the bag or cover the dish and refrigerate for at least 4 hours, or up to overnight, for the best flavor.

3. Grill the Chicken – Preheat your grill to medium heat. Remove the chicken from the marinade and discard the used marinade. Grill the chicken for 6-8 minutes per side, or until cooked through and lightly charred.

4. Optional Pineapple – If desired, grill pineapple slices for 2-3 minutes per side until caramelized and slightly softened.

5. Serve and Garnish – Serve the Huli Huli Chicken over steamed white rice, topped with chopped green onions and the grilled pineapple slices (if using).