Prime Rib Horseradish Sauce Recipe. 1 cup sour cream, ¼ cup prepared horseradish, 1½ tablespoons dijon mustard, 1 teaspoon white vinegar, 1 teaspoon worcestershire sauce, ½ tablespoon fresh chopped chives, salt and pepper to taste. With plenty of horseradish, fresh dill, and green onions, this is the best horseradish sauce we’ve ever had and.

After 15 minutes, place the prime rib on the grill, unwrapped, and insert meat probe. This creamy horseradish sauce is a must for serving with prime rib. Whisk ingredients together until fully combined.