Drizzle a little olive oil on sheet of aluminum foil. Place sliced potatoes on top in a small mound.
Drizzle with a little more oil, sprinkle with salt and pepper and top with a rosemary sprig.
Fold up foil to make a packet.
Grill seam side down for 15 minutes and then turn and finish grilling for 15 more minutes.
Open carefully because of the steam!
Video
Notes
Note - I used medium sized potatoes, I per person. If your potatoes are larger or smaller, adjust accordingly. While we love it with rosemary, feel free to substitute thyme or leave out the herbs, they are delicious even with the herbs.Can also add some garlic, but to keep it from possibly burning, layer some potatoes, add the garlic and layer more potatoes on top.