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 is fully dissolved and the mixture is well combined.
02 - Place the chicken breasts in a zip-top bag or shallow dish and pour the marinade over them, ensuring each piece is thoroughly coated. Seal tightly and refrigerate for at least 1 hour, or up to 4 hours for more pronounced flavor.
03 - Preheat your grill or grill pan to medium-high heat, approximately 375°F to 400°F, ensuring the grates are clean and lightly oiled to prevent sticking.
04 - Remove the chicken from the marinade, discarding any remaining liquid. Pat the chicken lightly dry and place it on the preheated grill. Cook for 6 to 7 minutes per side, or until the internal temperature reaches 165°F when checked with a meat thermometer.
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 fruit is lightly caramelized, about 1 minute per side.
06 - Transfer the grilled chicken to a serving platter and top each breast with a grilled pineapple ring. Garnish with chopped fresh cilantro and serve with lime wedges on the side.