Use your grill to make this quick, easy, and delicious meal. (No grill? Use a grill pan instead.)
Cook rice according to package instructions. Fluff rice with a fork and add parsley; toss to combine. Rinse onion under cool water. Drain, blot dry, and transfer to a medium bowl. Add peaches, sugar, lemon juice, and red-pepper flakes; season with salt and pepper. Let stand 15 minutes.
Meanwhile, heat a grill to medium-high. Clean and lightly oil hot grill. Season pork chops with salt and pepper. Grill until browned and cooked through, 10 to 12 minutes, flipping once. Serve chops with peach relish and rice.