Chicago-style relish

Chicago-style relish is a type of sweet pickle relish mostly used as a topping for Chicago-style hot dogs. When it comes to taste, it's practically the same as any other pickle relish, but what sets it apart is the neon green glow which is achieved by adding blue food coloring.

Chicago-style relish was probably created to serve as a promotional stunt by Vienna Beef Inc. sometime in the late 40s of the 20th century. However, some sources claim this emerald-colored relish was first used by Superdawg hot dog stand in 1949 in order to even out the color of the product and draw in the crowd.

Whatever the truth is, Chicago-style relish has become a staple, and no real Chicago-style hot dog experience can be complete without it (data says 80% of the dogs feature it).