Prime Rib Sauce for Dipping Posted on 11/12/2017 by cook Leave a comment Ingredients 1 c. sour cream 1/2 c. salad dressing mayonaise 1 T. horseradish 1 c. sour cream 1/2 c. salad dressing mayonaise 1 T. horseradish Directions Stir ingredients and dip prime rib in the sauce. Tangy good!