why have they been giving me relish and not pickle spears?

We went to the fabulous Field Museum in Chicago to see Sue the T-Rex

my whole life I’ve always aimed for 3 toppings on my dogs- relish, cheese, and tomatoes– in that order.
so when I go to a hotdog stand on the west coast a “chicago dog” is a natural choice.
some relish and some little chopped tomatoes.
much to my relish-loving delight, i discovered I have been sold an inferior product all these years!

this had actual pickles!

I don’t know what exactly those chopped and pickled things are.
some kind of onions and some kind of green stuff.
I didn’t want to look like a tourist so I didn’t ask.
I was hoping someone reading this could tell me what they we’re.

I’ll probably never have a reason to go back to Chicago but I’ll also never have a reason to let some fool call it a Chicago Dog if there aren’t any pickle spears!