Where did Sybil get the...
...Waldorf Salad?
Surely she wasn't able to make it herself(?) She had five minutes and was still rounding up ingredients which they supposedly didn't even have. Then she manages to make the recipe which requires a fair amount of chopping of vegetables and fruits, and make a sauce which has to be mixed with honey. That's assuming she would have a recipe, which she would have to search through cookbooks to find.
I suppose the joke was how in the hell did she get it, right?