Fable
Intermediate review at the tasting table
In Green Stone Alley there was a small eatery, and the chef wanted to revise a sour soup fish dish. The apprentice tried a new recipe every day and served it to several senior cooks in the kitchen. When they said it was too sour, he used less vinegar; when they said the fish tasted muddy, he added more ginger. After several rounds, everyone in the kitchen nodded.
The shopkeeper happily brought the dish to the guest's table, but the regular customer frowned: the soup aroma was enough, but it overpowered the fish flavor; the out-of-town guest complained that the spiciness fluctuated. The apprentice was unconvinced—hadn't the kitchen all agreed?
The master craftsman asked him, "Every time you make a change, do you give us the same bowl to taste?" The apprentice nodded. The master said, that bowl has been used by you to adjust the seasoning too many times; it can only tell you how to please the few of us, it cannot prove that customers will also be satisfied.
Later, the restaurant split into three sets of dishes. The first set was for apprentices to practice on, free to change at will; the second was kept for the kitchen to test regularly, specifically to decide heat, acidity and ginger quantity, recorded once tested and not allowed to count as final reputation; the third was reserved for the end of the month for unfamiliar guests to judge, used only for final verification and not for repeated adjustment.
Once an apprentice secretly peeked at the end-of-month customer feedback and then went back to change the recipe. The master crossed out that result: once you repeatedly tune against the final evaluation, it is no longer clean. True skill must pass a customer table you have not flattered yourself against.
At first the apprentice thought the second set of dishes was redundant, because it was neither practice nor the final reputation. The master said: precisely because it sits in the middle, it is suited to helping you adjust direction; without this table, you would only feel good about yourself during practice.
Later the restaurant also stipulated that the second set of dishes could be used many times, but each use had to record changes to the recipe. If the apprentice began catering specifically to the judges of that set, the sample had to be replaced, lest the adjustment turn into gaming. The shopkeeper also kept some guest tables that never took part in seasoning. Normally no one could touch those evaluations; they were brought out only before a new dish was finalized. In this way, the apprentice had room to adjust and also a final clean mirror to know whether he was only pleasing acquaintances.
The restaurant later followed these three tracks for all new dishes. The practice table let people learn, the retained sample dishes helped with adjustments, and the stranger's table tested success or failure. The apprentice finally understood: the middle set of dishes was not for showing off scores, but for tuning the recipe to be more reliable without contaminating the final test.