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Gather the ingredients.
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Place a large, deep, heavy skillet over medium-high heat.
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When skillet is hot, melt butter, and swirl to coat bottom of pan.
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Add mushrooms, garlic, and sweet onions.
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Toss gently to coat vegetables in butter.
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Sprinkle with salt, and cook, stirring occasionally, until mushrooms release their liquid, about 5 minutes.
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Continue to sauté until liquid has almost evaporated.
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Add red wine and beef stock.
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Reduce heat, and simmer until liquid has reduced by half, about another 5 minutes.
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Taste, adding additional salt and pepper if needed.
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Serve as a side with broiled or grilled steaks or as a side dish for any protein entree.