Of course, a classic Christmas dinner is not complete without a prime rib roast. Or more specifically a standing rib roast. Because, to be honest, the word “prime” doesn’t really mean much today. You see it everywhere. And most of the time it is not really what you think of as “prime”. You most likely thinking of the USDA grade “prime”. At this time of year many stores will advertise their “prime” rib roast but more often than not they are just using the colloquial term