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1
Season brisket with 1 tablespoon salt and 1/2 teaspoon pepper.
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2
Let stand at room temperature for 30 minutes to 1 hour.
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3
Heat 2 tablespoons oil in a large pot over medium-high heat.
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4
Add brisket in batches and cook, turning occasionally, until well-browned, 8 to 10 minutes per batch.
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5
Drizzle in additional oil if pan seems dry.
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6
Transfer browned meat to a paper towel-lined plate to drain.
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7
Add leek, celery and garlic to pan; cook until soft, about 7 minutes.
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8
Return meat to pot.
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9
Pour in 12 cups water, thyme, and bay leaves.
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10
Bring liquid to a simmer over medium heat.
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11
Cook, part covered, for 1 hour.
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12
Stir in carrots, parsnips, turnips, barley and remaining 1/2 tablespoon salt and 1 teaspoon pepper.
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13
Simmer until barley is cooked through and meat is tender, 45 minutes to 1 hour more.
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14
Stir in vinegar.
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15
Taste and adjust seasonings, if necessary.
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16
Just before serving make the kale: heat oven to 450 degrees.
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17
Make sure kale is very dry, then toss kale with remaining 1 tablespoon oil and a pinch of salt.
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18
Spread it out on one or two baking sheets.
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19
It should fit in one layer without crowding.
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20
Roast until leaves are crisp in places (some spots will still be soft), 5 to 10 minutes.
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21
Serve kale on top of soup.