The owner likes leftovers
The puzzle
At this restaurant, the owner is pleased when a customer leaves food on the plate.
See the answer (spoiler)
Spoilers from here on. If you want to work it out yourself, leave this folded and move on.
Answer
It is an eating challenge.
Finish the giant portion inside the time limit and it is free; fail, and you pay for it.
Every plate that is not cleared is money in the till.
