INGREDIENTS
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2 tablespoons olive oil
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1 pound beef sirloin,
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cut into 2 x 1 x 1/2-inch strips
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1 tablespoon plus 1 teaspoon salt
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3/4 teaspoon freshly ground black pepper, plus more for seasoning noodles
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5 tablespoons unsalted butter
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12 ounces mushrooms, quartered
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1 1/2 cups thinly sliced yellow onion
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1 tablespoon tomato paste
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2 tablespoons all-purpose flour
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1 (14-ounce) can reduced-sodium beef broth
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5 tablespoons sour cream
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2 teaspoons Dijon mustard
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1 (12-ounce) package wide egg noodles
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1 tablespoon chopped parsley