The Zen Hotdog Half Joke

At a recent visit to the Byam Shaw school of art, up at the top of Holloway Road, Archway, I found this poster advertising an exhibition, which tells half a joke.

Q: What did the Zen master say to the hotdog salesman?
A: Make me one with everything.

Good attempt noted. However, the interchange continued thus:

The hotdog salesman hands the Zen master a fat hotdog with relish, onions, mustard, the works, and says, "That'll be five dollars." The Zen master hands him a ten, and the hotdog salesman takes his money, and turns to the person behind him and says, "Next?"

The Zen master waits patiently until the hotdog salesman is done serving, then asks him, "What about my change?"

The hotdog salesman replies, "Change comes from within..."