Dumbwaiter

Effectively a machine that can be programmed to deliver an absolutely accurate synthetic copy of any food and drink known anywhere in the universe.

Problems occur for Kin Arad and Marco Farfarer when the machine malfunctions while on the other Discworld.

The only known supply of Shand protein for several light years in any direction is not operating. They have forty-eight hours, possibly fifty six, in which to find a substitute, or Silver is going to go into a feeding frenzy... and a carnivourous Shand in a feeding frenzy is not safe to be within a mile of.

Annotation

Dare we mention the replicators in Star Trek: The Next Generation? See annotation to Marco Farfarer.