Onions are not often thought of as an eating vegetable. However, when cooked in foil in campfire coals they become soft and sweet and make a great side.
Cut off the top and bottom parts of the onion. Peel off the onion skin, keeping the full onion intact. Cut a cross on the top of the onion about a third of the way down. Turn upside down and twist 45 degrees then cut another cross a third of the way down.
Place the onion on two sheets of foil. Top with the butter and sprinkle with the herb rub.
Wrap the onion tightly with the first sheet of foil, then repeat again with the second sheet of foil.
Place the onion in hot coals pulled away from the fire. Leave in the heat until the onion squeezed with tongs is soft, about 45 minutes.
When cooked, remove from the coals and let cool slightly before opening. Safety: The hot steam in the foil can burn you if opened too soon, so make sure to let it cool for a few minutes and be cautious.