RE: Christmas Dinner Prime Rib Side Suggestions
Our suggestion would be to keep the sides more classic. Your horseradish mashed potatoes sound great. We don't, however, suggest introducing Asian flavors (e.g. Coriander Prawns). When we plan a menu, we think about each component/dish getting along with each other - everything should be friends. By this we mean, we wouldn't necessarily mix Italian, Asian or French flavors together in this instance.
If you want to make prawns, you may want to use more classic flavors like a simple garlic/parsley butter. You are going to be cooking an expensive piece of meat, so focus on cooking it well because it's the main event. There is nothing wrong with serving a succulent prime rib with a delicious, well-made jus, mashed potatoes to soak up the juices, buttered peas, sauteed carrots and Yorkshire pudding. In fact, with that menu, feel free to invite us for dinner. :)
If you're looking to stretch the meal, just increase the quantity of the sides. You do not necessarily need to make a bunch of different dishes. You may also want to think about serving a few appetizers/hors d'oeuvres such as the Belgian Endive Salad, Warm Marinated Olives and maybe even a cheese platter (which can alternatively be served for dessert). Lots of ideas - our best advice is to keep it simple and focus on the cooking. Cheers!