INGREDIENTS
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3 Tbs. unsalted butter
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12 oz. assorted fresh mushrooms, cleaned, trimmed, and sliced 1/4 inch thick
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Kosher salt
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1/2 cup minced shallot (about 1 large)
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2 Tbs. Cognac
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3/4 cup lower-salt beef broth
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1 Tbs. vegetable oil
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4 6-oz. beef tenderloin steaks (about 1 inch thick), preferably at room temperature
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Freshly ground black pepper
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3 Tbs. sour cream
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1 tsp. Dijon mustard
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1/2 Tbs. minced fresh dill