Ingredients
Equipment
Method
Make the patties
- Form the ground beef into 4 thin patties and season with salt and pepper. Press so the thickness is even for consistent cooking.
- On each sheet of heavy-duty aluminum foil, layer the sliced potatoes and onion. Spread into a single layer so the steam cooks the potatoes evenly.
Assemble and cook the packets
- Place a burger patty on top of the potato-onion layer. Keep it centered so it sits above the highest heat.
- Add the tomato slices over the patty. Cover the surface to create a steamy layer inside each packet.
- Drizzle ketchup and mustard over each packet. Use a fork or spoon to distribute so the condiments melt into the juices.
- Fold the foil into sealed packets. Press the seams firmly so no steam escapes during cooking.
- Place the packets on a campfire grate over medium heat and cook for 25-30 minutes. Flip halfway through so the potatoes soften and the patties cook through.
Melt cheese and serve
- Open each packet and add cheese slices. Cover loosely and reseal briefly to melt the cheese until glossy and dripping.
- Let the packets cool for 5 minutes before serving. The juices will thicken slightly for cleaner bites.
- Serve the packets as-is or on hamburger buns. If using buns, spoon the filling directly onto them.
Notes
Pro tip: slice potatoes thinly and press foil seams tightly—this keeps everything steaming so the potatoes turn tender instead of firm. Store leftovers in the refrigerator up to 3 days in airtight containers; reheat in a skillet or oven until hot. Freezing is not recommended because foil packets can get watery when thawed. For a lower-carb swap, serve without the hamburger buns and increase the potato slices slightly only if needed for texture.
