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Can I partially cook a potato, via oven or microwave, then wrap in foil and an hour later complete cooking on a barbecue grill?
You are on the right track by cooking the potato in the oven without foil and adding it later to help hold in the heat. A potato is about 80% water, so this cooks away most of it. Cook until the internal temperature is 185°F, about 50 minutes at 400°F.
I have also not wrapped the potato in foil after baking and put it into a pre-warmed cooler for transportation before placing on the upper rack of the BBQ to warm up. To pre-warm a cooler, use a teapot on the stove, heat until boiling, fill the plastic cooler with hot water, seal for a few minutes (3-5) and then drain and add the hot baked potatoes.
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