Jason's Deli House Ranch Dressing?

Does anyone know a "copycat" recipe for this? It is not just run of the mill ranch dressing... there is something in it (that I cannot pinpoint) that makes it WONDERFUL! Everyone here at the house LOVES it & when we get sandwiches etc. from there I always order a soup cup of it so we can have it here at home. I would just like to be able to make it myself though. If anyone has eaten there you will know the difference I am speaking of & can possibly let me know what to add to ranch dressing to make it taste like Jason's. Thanks!