Christmas Dinner - one day after

My brother flew in late on Christmas day, and further postponement of present unwrapping was not an option so the official Christmas dinner waited one additional day.  Dinner included a prime rib roast (is there really a choice if you're from a cattle ranching family), mashed potatoes, cheese onions, broccolini, and two types of gravy. 

For the meat, we used the quick cook sear the crap out it for 15 minutes, then cook at 350 approach.  This makes for some damn tasty outer crust.  And by crust, I mean crunchy morsels of spice charred meat fat.  Everyone has their own way of making mashed potatoes, probably all pretty good, especially with gravy. The most important thing, however; is to add at least a whole stick of butter regardless of how many potatoes you're having.  Obviously you could add more, but I'd be hard pressed to understand why less would be a good idea.  Pearl cheese onions are a tradition in my family, not much to them as long as you can convince someone else to peel them.  Peeling them sucks (thanks mom), but definitely worth the effort. 

Gravy -
Not a lot of explanation is needed here, unless for some reason you decided not to make this after cooking a fatty piece of meat.  Why would you ever skip the gravy?  The first gravy was a traditional gravy made with the potato water and thickened.  I also made a Stilton Madera gravy from the link below.  I substituted Madera since I didn't have any port. 

Stilton Gravy Recipe