When the fire is ready, put the cooking grate in place. In a large disposable foil pan over direct medium heat (350° to 450°F), melt the butter. Carefully add the onions in a single layer and season with the salt and pepper. Using tongs, turn the onions in the butter to coat them.
Slide the pan over indirect medium heat and cook, with the lid closed, until the onions are very tender and just beginning to brown, 10 to 15 minutes, carefully turning the onions once or twice. If desired, to keep the onions warm, cover the pan with foil and let the onions continue to cook over indirect heat for as long as 30 minutes. Wearing insulated barbecue mitts or gloves, remove the pan from the grill. Splash the vinegar and sprinkle the parsley over the onions. Serve warm.
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