Peaches and pineapples are both delicious when grilled.
Try sprinkling them with Gochugaru( Korean chili flakes) after grilling.
The pineapple should be sliced and cored and then you can add whatever spices you want! You can even grill them plain and enjoy them as an accompaniment to chicken or pork or fish. They are also good on skewers. I find a sprinkle of chili powder or curry is delectable.
Peaches can be halved or sliced and put on skewers. You can try them plain or with honey and hot salt. Some people enjoy them with a pinch of just chili flakes to balance the sweetness of the fruit.
Great on their own or with chicken, or pork.