01 - In a mixing bowl, whisk together the pineapple juice, soy sauce, brown sugar, olive oil, minced garlic, grated ginger, and black pepper until the sugar dissolves and the mixture is well combined.
02 - Place the chicken breasts in a large zip-top bag or shallow dish. Pour the marinade over the chicken, ensuring each piece is thoroughly coated. Seal the bag or cover the dish and refrigerate for at least 1 hour, or up to 4 hours for more pronounced flavor.
03 - Preheat your outdoor grill or grill pan to medium-high heat, approximately 375°F to 400°F.
04 - Remove the chicken from the marinade and discard the used marinade. Pat the chicken lightly with paper towels. Place the chicken on the grill and cook for 6 to 7 minutes per side, or until the internal temperature registers 165°F on a meat thermometer and the juices run clear.
05 - During the last 2 minutes of grilling, place the pineapple rings directly on the grill grates. Cook until distinct grill marks appear and the pineapple is lightly caramelized, then flip once.
06 - Transfer the grilled chicken to serving plates and top each breast with a grilled pineapple ring. Garnish with chopped fresh cilantro and serve with lime wedges alongside.