1.
To caramelize the onions, pour one tablespoon of oil into a heavy saucepan and heat. Add the onions, sugar and balsamic vinegar and cook over medium-low heat, stirring occasionally until the onions are soft and brown in color, about 25 minutes. Refrigerate until using.
2.
In another heavy pan, heat the oil. Add the mushrooms and sauté until they are soft, about three to four minutes. Strain the mushrooms to remove any excess water.
3.
Sprinkle the mushrooms with Kosher salt and freshly ground pepper.
4.
Combine the mushroom and onion mixtures.
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