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1
Place the oxtail in a stockpot or Dutch oven over high heat and cover with 2 inches of water.
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2
Bring to a boil, then decrease the heat to low and simmer for 3 to 4 hours.
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3
Check the pot occasionally to skim off any foam and top off the water as necessary to keep the oxtail covered.
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4
Cook until the meat easily pulls away from the bone.
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5
When the oxtail is ready, remove from the water with tongs and place on a sheet pan to cool.
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6
Strain the stock through a fine-mesh sieve or chinois and then skim the fat.
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7
You should have about 2 quarts of stock.
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8
If not, add water to make 2 quarts.
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9
Set aside.
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10
When the oxtail is cool enough to handle, remove the meat from the bones and discard the bones.
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11
Heat the olive oil in a Dutch oven or stockpot over medium-high heat and add the onion and garlic.
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12
Saute until the vegetables are soft but not colored.
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13
Add the farro and stir to coat in the oil.
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14
Add the stock and bring to a boil, then decrease the heat to low and simmer until the farro is almost tender, about 20 minutes.
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15
When the farro is nearly tender to the bite, add the parsnip, carrot, celery root, celery, and oxtail meat.
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16
Simmer for about 20 minutes longer, or until the vegetables are tender.
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17
If making ahead, remove the soup from the heat at this point and put in the fridge to cool.
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18
If serving immediately, add the minced parsley and serve.