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4 ounces fresh mushrooms
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3 tablespoons butter, divided
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1/4 cup onion, chopped
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1 garlic clove, minced
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1 10.5 ounce can condensed beef broth
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1 1/2 tablespoons tomato paste
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1/8 teaspoon ground black pepper
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2 teaspoons cornstarch
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1 tablespoon cold water
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2 tablespoons dry red wine
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