How are you having it cooked? We're doing a plated dinner and prime rib is one of our options. They obviously have to cook the whole roast to the same temperature. I told them medium rare, because I think that is how the majority of my family likes their meat. I just feel bad for everyone who would want theirs well done. I'm sure it can be sent to the kitchen and cooked more, but that's not the ideal situation while everyone else is eating. Just not sure what the proper etiquette is here, if there even is any.