16 ounces small brown mushrooms, brushed clean and stems removed (save the stems for a stock, if you like)
1 yellow onion, sliced
3-4 cloves garlic, grated or finely minced
2 tablespoons olive oil
2 tablespoons butter
1/3 cup dry Sherry wine
Salt, to taste
Freshly chopped Italian parsley, for garnish
Heat butter and olive oil in a large, heavy skillet to medium-high on the stove top. Add onions and mushrooms and stir to coat with the fat. Season lightly with salt. Cook, until the mushrooms and onions begin to brown, about 7-8 minutes.
Once the mushrooms and onions are browned, remove them from the pan with a slotted spoon and set aside. Add sherry wine to the pan, making sure to scrape up the brown bits from the bottom of the pan with a wooden spoon. Cook until the liquid has reduced by half.
Add garlic to the pan and cook for one minute. Turn off the heat, add mushrooms and onions back to the pan, and fold gently to combine. Garnish with parsley and serve.