Have you made a choice on this cut yet?
As I haven't cooked many Prime rib roasts under 16lbs (whole lion) I was looking into some other sources for info. This recipe may apply well for your Christmas dinner.
Using butcher twine to tie the roast is important for presentation and even cooking., some loins really flatten out, looking almost like a Ney York strip loin so instead of 8" diameter your roast cooks like a piece 4" thick. I use netting.
These pics are loins I am dry aging in various stages up to 45 days. (The restaurant where I work now doesn’t want to buy netting but even though these are dry aging you can see what happens without trusting with twine.)
Note: 450f step can be done in your home oven without detriment to flavor.
Good luck! Hope this helps.
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