Mix together the pineapple juice, brown sugar, soy sauce, and garlic powder together in a large plastic zipper bag.
Place the pork chops in the marinade, seal the bag , and refrigerate overnight. Keep the pineapple rings aside.
Preheat an outdoor grill for medium heat, and lightly oil the grate.
Remove the chops from the marinade, shaking off excess, and grill until browned, the meat is no longer pink inside, for about 5 to 8 minutes per side.
Brush several times with marinade and let the marinade cook onto the surface of the meat.
Place 4 pineapple rings onto the grill, and allow to cook until hot and the slices show grill marks; serve the chops topped with the grilled pineapple rings in a serving platter.
Notes
What is special in this recipe is the pineapple. Pineapple contains an enzyme called" Bromelain", this enzyme acts on softening meat and adding a rich flavor to it.