I hope the chef used his world famous sun brewed mayonnaise on the burger.
...Or maybe the frohmunda cheese.
LOL - my father was a bacteriologist - he said that during WWII when they couldn't get supplies of the medium normally used for growing bacteria, they would use Hellmans/Best Foods mayonnaise. He said it was probably the best natural growing medium for all sorts of bacteria. If we left a jar of mayonnaise open for 10 minutes, he threw it out, and he wouldn't eat anything with mayonnaise in it unless he knew how the stuff had been stored and handled. Seemed weird at the time, but he'd seen a lot of salmonella in his work. Curiously, he liked rare meat. But, he was fastidious about how it was handled and stored. We had surgical/antibacterial soap in the house long before it was commercially available.
Why not? Jesse Jackson had a famous cole slaw mix..