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1
Heat a large skillet over medium heat for 3 to 4 minutes.
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2
Raise the heat to high and heat 1 tablespoon oil.
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3
Season the beef with salt and pepper.
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4
Add the beef to the skillet, arranging it in a single layer, and saute, without stirring, until well browned and still pinkish inside, 1 to 2 minutes.
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5
(It is key to only partially cook the meat at this stage, since it will finish cooking later in the sauce.)
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6
Transfer to a large plate and set aside.
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7
Discard any excess oil.
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8
Return the skillet to medium-high heat.
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9
Add 1 tablespoon of the oil and heat.
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10
Add the mushrooms and cook, stirring occasionally, until well browned, about 7 minutes.
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11
Season with salt and pepper.
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12
Using a slotted spoon, transfer to the plate with the beef.
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13
Heat another tablespoon of oil.
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14
Add the onions, carrots and parsnips and cook, stirring, until lightly caramelized, about 5 minutes.
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15
Add the tomato paste and cook, stirring, until lightly browned, about 1 minute more.
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16
Whisk in the flour and cook, stirring, for 1 minute.
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17
Pour in the beef broth and, whisking constantly, bring to a full boil.
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18
Reduce the heat, add the greens and simmer until the greens and veggies are crisp-tender, 5 to 10 minutes.
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19
Remove from the heat.
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20
Whisk in the sour cream, mustard and lemon juice and season with pepper to taste.
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21
Add the beef and any juices, mushrooms and parsley to the sauce and reheat over medium heat just until hot.
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22
(Do not boil.)
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23
Toss the barley with the remaining 1 tablespoon olive oil and lots of freshly ground black pepper.
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24
Divide the cooked barley among 4 plates and top with the stroganoff.
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25
Serve immediately.