Prime rib method advice? First time cooking one!

TheToast

Hey all. It’s been ages since I posted. Hope everyone is doing great. I’m cooking a beautiful 5kg prime rib roast (bone in) tomorrow and would love your advice as to the best method. I’ve never cooked one before and really don’t want to mess it up!

I was planning to follow this https://www.biggreenegg.co.uk/blog/recipes/ingredient/beef/richs-smoked-prime-rib

But perhaps cook at 110c / 230f and pull it at 55c / 130f. By the time it’s reverse seared and then rested for 20 mins I’d hope it’s no more than 59c / 138f Internal temp - I don’t want it any more than medium rare. Or even rare is ok to not risk it overcooking while resting (I’ll be juggling roast potatoes, and loads of other sides at the same time so it may end up resting for longer than planned). 

Any guesses as to how long it’ll take appreciated - trying to time it with a big group of friends arriving. 

There’s another method I’ve seen where it’s cooked at 90c / 190f from a book I really trust but that’s a really low temp so I’m not sure. 

jtcBoynton

A couple of comments on the recipe you linked:

1-2 hours before cooking and let it reach room temperature.

It will not make it to room temp in that amount of time.  This seems to be one of the most often repeated phrases that is just wrong.  Sit it out for a while if you want, but it really doesn't make much of a difference.

pre-soaked smoking chips

I don't think beef roast needs smoke, but add if you want.

internal temperature reaches 60c (140f) - the perfect temperature for a prime rib.

The perfect temp for a prime rib is 132ºF. 

sear each side for trademark searing lines

Sear lines are not the goal - 100% of the surface with a crust is the goal. Sear lines mean around 60% of the surface is just overdone meat without the crust flavor.

rest in a warm place for at least 30 minutes

Don't see a need to rest this long. Resting will be more useful if you over hammered the cook but if you have an edge to edge 132ºF cook it doesn't need to sit that long.

A good read on how to cook a prime rib can be found at:

https://amazingribs.com/tested-recipes/beef-and-bison-recipes/prime-rib-and-other-beef-roasts

TheToast

@jtcBoynton Thanks. Agree with all of that - I wasn’t planning to use chips. Quality beef doesn’t really need smoke wood IMO - unless it’s brisket. 

TheToast

Any bets on how long a 5kg joint of beef will take at 110c/230f?

littlerascal56

If it sat out for 2-3 hours on the counter that 11 lb slab probably will still take 2.5 + hours at that temp.