You will not believe how fabulous this is .... and nothing could be simpler!

Peel the onions, cut off the tough root end and cut them in half across the middle. Place the halves cut-side-up in a baking pan (we use Pyrex). Bake at 350°F in the oven or at medium-high in the microwave until very tender. Drizzle with the balsamic vinegar and allow it to penetrate the layers of the onion. Drizzle a little olive oil and sprinkle with salt to taste. This is a wonderful side dish to accompany meats, such as roast beef and, of course, that Thanksgiving or Christmas turkey.