Arctic Circle food chain claims to have invented "fry sauce'in 1948. However, their sauce recipe is a very guarded secret. Some say fry sauce is really just Thousand Island dressing, renamed. Fry sauce should be smooth. At one point Utah was the "fry sauce" state. I know that when I ask for "fry sauce" in any other state east of Colorado, I am looked at very funny. Other fast food restaraunts like Carls Jr, Hires, Big H, Apollo Burger, and The Training Table offer their own variation on the popular sauce. Up until 1999 Utah's McDonalds franchised offerred the fry sauce.