Preheat an outdoor grill for medium heat and lightly oil the grate.
Slice potatoes carefully through a long side, almost to the bottom but not through, to create even, fan-like cuts.
Pull slices apart gently and sprinkle potatoes with salt and pepper. Place onion and butter slices between potato slices. Wrap each potato in heavy-duty aluminum foil and seal well.
Bake on the preheated grill until soft, turning occasionally, about 1 hour. Remove from grill and let sit 10 minutes before unwrapping.
Nutritional Facts
Per 4 servings
Calories: 533
Carbohydrate: 75g
Fat: 24g
Fiber: 10g
Protein: 9g
Sugar: 8g
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