INGREDIENTS
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2 Tablespoons Butter
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2 whole Large Onions, Halved And Sliced Thin
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1/4 cup Beef Broth
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7 dashes Worcestershire Sauce
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Splash Of Red Or White Wine
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1/2 cup Grated Gruyere Cheese (can Use Swiss)
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Kosher Salt
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24 whole White Or Crimini Mushrooms, Washed And Stems Removed
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Minced Parsley
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