My Approach would be to monitor the kitchen on a daily basis and to warn the waiter when the cook has his bad days eventually. This to enable him to warn the guest of quality fluctuations and to avoid disappointments which would, if happening too often, make the guests look for a different location. In the best case the waiter would even recommend a different location or try to replace the chef and what makes the waiter to become the trusted advisor to whom the guest will return irrespectiv where he works. By this the waiter will be the key for stable joy and keep the guest in the long run. Sometimes the waiters role can be assumed by a robot if processes are automized but the personal relationship will never fully disappear. This is somewhat our approach.