Red Robin is known for great gourmet hamburgers and tasty cocktail concoctions, but the 400-plus-unit chain also serves a huge tower of onion rings that comes with a side of this creamy, slightly sweet-and-smoky dipping sauce. An Internet search offered up a few clues about what might be mixed into this mystery sauce, but the complete culinary conundrum was yet to be solved. A mixture of mayonnaise and barbecue sauce was a good starting point, but with so many varieties of barbecue sauce on the market I had to figure out which came closest to the flavor of the original Campfire Sauce. So, I went back to Red Robin, obtained a sample of the barbecue sauce they use, and conducted a side-by-side taste test of all the major brands on the market. After more spoonfuls of straight barbecue sauce that any human should consume at one sitting, I finally concluded that Bull's-Eye Brown Sugar and Hickory comes the closest to the sauce used at the restaurant. A little more experimentation with this sauce, some mayonnaise and a couple of other ingredients, and I eventually had in front of me an awesome re-creation of the delicious dipping sauce that can be served with home-baked onion rings, poppers, french fries, or as a really great hamburger spread. Mission accomplished.