The waiter gets a commission for every item sold. The client gets the experience they like and are willing to pay for.
A restaurant that doesn’t have a fixed price list for its menu. Each waiter has their own price list, and it’s their job to sell the experience, themselves and their prices to the clients – bring them in and make them return. The restaurant helps with the marketing, but prospecting and sales are up to the waiter.
Provide a better experience for your restaurant’s clients and make them return.
Track repeat customers’ habits: what they order regularly, and prepare for them a custom menu that has their favorite items. Next time they come in, present it to them along with the regular menu.