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Grills vary widely, so you may need to experiment with the heat setting. For my propane grill, I use medium-high heat, or even high heat, high enough to sear/brown the meat dish when I throw them on the grill.).
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Wash potatoes and cut into slices 1/4 inch or so with skin intact.
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Slice onion into thin slices, then separate into rings.
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On heavy duty aluminum foil, about 18" to 24" long, put in the center a layer of potatoes (leaving plenty of foil on each side and each end to fold and seal the packet).
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Follow with a layer of onion rings.
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Sprinkle with salt, pepper, and a hint of garlic (powder, or freshly minced).
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Repeat layers, dotting each second layer with butter.
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Wrap the foil securely around the layers. Should make a packet about 15"-18" long and 10" wide.
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Put the foil package on the grill about 45 minutes to an hour before the intended serving time. (These can also be prepared as described, but placing the packet in a stainless steel skillet on the stove top. Or in the oven. Be creative!).
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It’s okay if the bottom layer “caramelizes;” some will love those bottom pieces!