Step 1

Cut large pieces of aluminum foil (one for each potato), then spray or brush liberally with the oil. Set aside.

Step 2

Peel and slice the onion evenly.

Step 3

Clean the potatoes well. Then carefully slice them into 1/4 inch slices (about 0.5-0.6 cm). I recommend using a very sharp knife or a mandoline for this so you get an even thickness.As you cut the potatoes, lay them out on the oiled foil. Don't crowd them - this will keep them crispy on the grill.

Step 4

Add 1/5 of the onions and 1 Tbsp of butter and season with salt and pepper. Fold the foil tight around the potatoes.

Step 5

Add the potato packs to a medium-high heat grill and allow to cook for 30-40 minutes. Flip the potatoes halfway through - this will make them deliciously crispy with a tender inside.

Step 6

Remove carefully from the grill and enjoy.