If you were a Catalan cowboy, you would roast the unpeeled onions in the coals without wrapping them. This version is easier. Use a mild sweet onion hybrid of the Yellow Granex type: Maui (Hawaii), Vidalia (Georgia), or that European onion transplanted to Washington State, the Walla Walla Sweet.
If you are baking or spit-roasting meats, quarter a few of these onions and put under the meat. All the juices will drip down onto them, the fire will cook them, and then you will want to throw away the meat and eat the onions by themselves with a great glass of draft Pilsner Urquell.
Eat them whole as a course with warm tomato-shrimp sauce; serve them as is with grilled meats; or chop them up to make a sauce with lemon juice, extra virgin olive oil, and chopped rosemary.
Put a bay leaf, a piece of the chipotle, a thyme sprig, and some cumin seeds in each of the cavities. Wrap each onion in two slices of bacon. Put each onion in a piece of foil large enough to wrap it, and spoon
Wrap each onion and cook in the embers of a cooling wood (or charcoal) fire, in a wood oven, or in a skillet covered with aluminum foil in a regular home oven. If cooked this way you can omit the step of wrapping each onion individually.
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