How do you get people to tell the truth?

A restaurant has a staff of 10 servers. The servers have all stored their daily tips in their own personal tip jar located in the restaurant's kitchen. An earthquake occurs and all the tip jars are smashed and all the tip money is mixed together. The restaurant manager gathers up all the money and wants to return it to the servers, giving each the amount of money to which she is rightfully entitled. Each server knows how much money was hers, but nobody knows how much belongs to anybody else. Obviously, each server, if asked, will exaggerate her fair share. How can the money be returned to the rightful servers?