When I go to Red Robin in Canada I get plum Sauce for my fries. In America, they do not have plum sauce and look at me like some crazy-canadian....
Plum Sauce is similar to sweet & sour sauce but made with sweet fruits (such as plums) as well as vinegar and other spices.
Often associated with Asian Cuisine, it has been made sweeter and mass produced for fast food places (such as Mc Donalds) and resturant (such as Red Robin)
It's sweet and delicious and great with chicken strips, french fries or anything else you like to dip in sauce.