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1
Adjust oven rack to lower position and preheat oven to 250u00b0F (121u00b0C). Heat oil in a large Dutch oven over high heat until lightly smoking. Add beef shins or oxtail and soup bones. Cook, flipping and stirring pieces occasionally, until well browned on all surfaces, about 15 minutes. Using tongs, transfer beef to a large plate and set aside.
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2
Add carrot, celery, and onion to pot and cook, stirring occasionally, until starting to lightly brown, about 8 minutes. Add wine, bay leaves, thyme, and parsley and cook, scraping up browned bits from bottom of pot. Bring to a boil and cook until reduced by half, about 10 minutes. Add chicken stock, bring to a boil, and cook until reduced by half, another 10 minutes.
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3
Arrange beef shins/oxtail and bones in the bottom of a large roasting pan. Pour entire contents of Dutch oven on top of bones and spread vegetables around into an even layer. Place a V-rack on top, arranging meat and vegetables so that rack rests on bottom of pan.
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4
Season rib roast generously with salt and pepper on all sides and place on rack with fat cap facing up. Place in oven and cook until center of roast registers 125u00b0F (52u00b0C) on an instant-read thermometer for medium-rare or 135u00b0F (57u00b0C) for medium, 4 to 5 hours.
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5
Remove roast from oven, transfer to a large plate, and tent loosely with aluminum foil. Place in a warm spot in the kitchen and allow to rest while you finish the jus. Meanwhile, increase oven temperature to highest possible setting, 500 to 550u00b0F (260 to 288u00b0C).
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6
Using tongs, remove shins/oxtail from roasting pan and transfer to a medium saucepan. Pour remaining contents of pan through a fine-mesh strainer into saucepan. Discard strained vegetables and bones. (Reserve marrow, if you like, for spreading on bread or mixing back into jus.)
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7
Using a ladle, skim excess fat off top of liquid and discard. Bring liquid to a boil, reduce to a simmer, and cook until shins/oxtail are completely tender, about 20 minutes. Transfer shins/oxtail to a serving plate and tent with foil to keep warm. Season jus to taste with salt and pepper (you may not need any salt). Stir in butter off heat. Keep warm.
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8
Wipe out roasting pan and replace V-rack. Remove foil from prime rib and place on top of rack with fat cap facing up. Ten minutes before guests are ready to be served, place roast back in hot oven and cook until well browned and crisp on the exterior, 6 to 10 minutes. Remove from oven, carve, and serve immediately, serving shin/oxtail meat on the side and passing hot jus around the table.
