Put the onions, carrots, parsnips, and garlic into the bottom of a large roasting pan. Place the roast, rib side down, on top of the vegetables. In a small bowl mash together the horseradish, garlic, rosemary, thyme, salt, pepper, and olive oil to make a paste. Smear the paste generously over the entire roast and drizzle with some extra oil. Roast for about 1 1/2 to 2 hours or approximately 20 minutes per pound for medium-rare. Check the internal temperature of the roast in several places with an instant-read thermometer, it should register 125 degrees F. for medium rare. Remove the beef to a carving board, cover it with foil, and allow it to rest for 20 minutes. Note: the internal temperature of the meat will continue to rise about 10 degrees. Remove the vegetables and set aside. Pour the pan juices into a fat separator and set aside to allow the fat and beef juices to separate. Use the juices to serve with the meat and save the fat for Yorkshire pudding.

Herbed Yorkshire Pudding Recipe courtesy Tyler Florence

3 eggs 1 1/4 cups milk 1 1/4 cups all-purpose flour 3 tablespoons chopped fresh mixed herbs such as chives, thyme, and parsley Kosher salt and freshly ground black pepper 1/4 cup reserved beef drippings or melted butter Preheat the oven to 450 degrees F. Place an 8 by 12-inch enameled cast iron baking dish in the preheated oven for 10 minutes. Meanwhile, in a mixing bowl, beat the eggs until foamy and light. Whisk in the milk until combined. Add the flour, herbs, a big pinch of salt, and some pepper, beat just until the batter is smooth. Pour the beef drippings into the bottom of the hot pan. Immediately pour in the batter and bake for 10 minutes. Reduce the oven temperature to 350 degrees F and continue baking for 15 to 20 minutes until the pudding is puffy and brown. Serve immediately, it deflates rapidly.