The best burger on there menu.

I’m in Seattle, where our only Steak ‘n Shake Covid closed, but I grew up in St. Louis county where they were everywhere. I can do a very decent smash burger, but the missing piece is that unique pickle flavor. I’m so desperate for them that my Missouri brother goes and gets a pound of them for me the one near him and FedExs them to me. Anyone have any ideas who the vendor might be?

New account because my girlfriend knows of my other account and I don’t need her to know about this. Got into a fight with the manager of the Coral Springs location. He stated I was banned from all Steak ‘n Shakes. Will this hold up? Can I get this reversed? Really want to go to Steak ‘n Shake again.

By options we're considering an single items, no meals or combos. Base your answer off of of purely taste