Thinly slice potatoes almost all the way through. Potatoes should still be able to maintain their shape and be connected on the bottom.
Peel and quarter sweet onion. Slice thinly.
Stuff the thin onion slices in between the potato slices.
Place stuffed potato on a piece of foil. Liberally drizzle olive oil and sprinkle fresh cracked salt and pepper on top. Wrap potatoes with foil, gathering the sides of the foil to meet on the top of the potato.
Grill on a medium-high heat (about 350 degrees) for about 35-45 minutes. Cook time will depend on the size of your potatoes. Potatoes are done when they’re caramelized and crunchy on the bottom and soft and tender inside.
Remove from grill, allow to briefly sit and unwrap carefully – they’ll be hot! Enjoy!