Sirloin Steak with Mushrooms
Ingredients:
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1 (12 ounce) sirloin steak
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salt and freshly ground black pepper to taste
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2 tablespoons oil, or as needed
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⅓ cup shiitake mushrooms, stems discarded, caps thickly sliced
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½ shallot, sliced
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1 clove garlic, peeled
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⅓ cup dry white wine
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⅓ cup beef broth
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¼ cup butter, cubed
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2 tablespoons chopped fresh tarragon